Averages/Arithmetic mean: Difference between revisions
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{{task|Probability and statistics}} |
{{task|Probability and statistics}} |
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;Task |
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{{task heading}} |
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Write a program to find the [[wp:arithmetic mean|mean]] (arithmetic average) of a numeric vector. |
Write a program to find the [[wp:arithmetic mean|mean]] (arithmetic average) of a numeric vector. |
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=={{header|0815}}== |
=={{header|0815}}== |
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<syntaxhighlight lang=0815> |
<syntaxhighlight lang="0815"> |
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{x{+=<:2:x/%<:d:~$<:01:~><:02:~><:03:~><:04:~><:05:~><:06:~><:07:~><:08: |
{x{+=<:2:x/%<:d:~$<:01:~><:02:~><:03:~><:04:~><:05:~><:06:~><:07:~><:08: |
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~><:09:~><:0a:~><:0b:~><:0c:~><:0d:~><:0e:~><:0f:~><:10:~><:11:~><:12:~> |
~><:09:~><:0a:~><:0b:~><:0c:~><:0d:~><:0e:~><:0f:~><:10:~><:11:~><:12:~> |
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=={{header|11l}}== |
=={{header|11l}}== |
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{{trans|Python}} |
{{trans|Python}} |
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<syntaxhighlight lang=11l>F average(x) |
<syntaxhighlight lang="11l">F average(x) |
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R sum(x) / Float(x.len) |
R sum(x) / Float(x.len) |
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=={{header|360 Assembly}}== |
=={{header|360 Assembly}}== |
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Compact and functional. |
Compact and functional. |
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<syntaxhighlight lang=360asm>AVGP CSECT |
<syntaxhighlight lang="360asm">AVGP CSECT |
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USING AVGP,12 |
USING AVGP,12 |
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LR 12,15 |
LR 12,15 |
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Called as a subroutine (i.e., JSR ArithmeticMean), this calculates the integer average of up to 255 8-bit unsigned integers. The address of the beginning of the list of integers is in the memory location ArrayPtr and the number of integers is in the memory location NumberInts. The arithmetic mean is returned in the memory location ArithMean. |
Called as a subroutine (i.e., JSR ArithmeticMean), this calculates the integer average of up to 255 8-bit unsigned integers. The address of the beginning of the list of integers is in the memory location ArrayPtr and the number of integers is in the memory location NumberInts. The arithmetic mean is returned in the memory location ArithMean. |
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<syntaxhighlight lang=6502asm>ArithmeticMean: PHA |
<syntaxhighlight lang="6502asm">ArithmeticMean: PHA |
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TYA |
TYA |
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PHA ;push accumulator and Y register onto stack |
PHA ;push accumulator and Y register onto stack |
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=={{header|8th}}== |
=={{header|8th}}== |
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<syntaxhighlight lang=forth> |
<syntaxhighlight lang="forth"> |
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: avg \ a -- avg(a) |
: avg \ a -- avg(a) |
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dup ' n:+ 0 a:reduce |
dup ' n:+ 0 a:reduce |
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=={{header|ACL2}}== |
=={{header|ACL2}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="lisp">(defun mean-r (xs) |
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(if (endp xs) |
(if (endp xs) |
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(mv 0 0) |
(mv 0 0) |
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=={{header|Action!}}== |
=={{header|Action!}}== |
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{{libheader|Action! Tool Kit}} |
{{libheader|Action! Tool Kit}} |
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<syntaxhighlight lang= |
<syntaxhighlight lang="action!">INCLUDE "D2:REAL.ACT" ;from the Action! Tool Kit |
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PROC Mean(INT ARRAY a INT count REAL POINTER result) |
PROC Mean(INT ARRAY a INT count REAL POINTER result) |
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=={{header|ActionScript}}== |
=={{header|ActionScript}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="actionscript">function mean(vector:Vector.<Number>):Number |
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{ |
{ |
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var sum:Number = 0; |
var sum:Number = 0; |
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=={{header|Ada}}== |
=={{header|Ada}}== |
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This example shows how to pass a zero length vector as well as a larger vector. With Ada 2012 it is possible to check that pre conditions are satisfied (otherwise an exception is thrown). So we check that the length is not zero. |
This example shows how to pass a zero length vector as well as a larger vector. With Ada 2012 it is possible to check that pre conditions are satisfied (otherwise an exception is thrown). So we check that the length is not zero. |
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<syntaxhighlight lang=ada>with Ada.Float_Text_Io; use Ada.Float_Text_Io; |
<syntaxhighlight lang="ada">with Ada.Float_Text_Io; use Ada.Float_Text_Io; |
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with Ada.Text_IO; use Ada.Text_IO; |
with Ada.Text_IO; use Ada.Text_IO; |
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=={{header|Aime}}== |
=={{header|Aime}}== |
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<syntaxhighlight lang=aime>real |
<syntaxhighlight lang="aime">real |
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mean(list l) |
mean(list l) |
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{ |
{ |
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{{works with|ALGOL 68G|Any - tested with release mk15-0.8b.fc9.i386}} |
{{works with|ALGOL 68G|Any - tested with release mk15-0.8b.fc9.i386}} |
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{{works with|ELLA ALGOL 68|Any (with appropriate job cards) - tested with release 1.8.8d.fc9.i386 - note that some necessary LONG REAL operators are missing from ELLA's library.}} |
{{works with|ELLA ALGOL 68|Any (with appropriate job cards) - tested with release 1.8.8d.fc9.i386 - note that some necessary LONG REAL operators are missing from ELLA's library.}} |
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<syntaxhighlight lang=algol68>PROC mean = (REF[]REAL p)REAL: |
<syntaxhighlight lang="algol68">PROC mean = (REF[]REAL p)REAL: |
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# Calculates the mean of qty REALs beginning at p. # |
# Calculates the mean of qty REALs beginning at p. # |
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IF LWB p > UPB p THEN 0.0 |
IF LWB p > UPB p THEN 0.0 |
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=={{header|ALGOL W}}== |
=={{header|ALGOL W}}== |
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<syntaxhighlight lang=algolw>begin |
<syntaxhighlight lang="algolw">begin |
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% procedure to find the mean of the elements of a vector. % |
% procedure to find the mean of the elements of a vector. % |
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% As the procedure can't find the bounds of the array for itself, % |
% As the procedure can't find the bounds of the array for itself, % |
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Because of the way Amiga E handles floating point numbers, the passed list/vector must contain |
Because of the way Amiga E handles floating point numbers, the passed list/vector must contain |
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all explicitly floating point values (e.g., you need to write "1.0", not "1") |
all explicitly floating point values (e.g., you need to write "1.0", not "1") |
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<syntaxhighlight lang=amigae>PROC mean(l:PTR TO LONG) |
<syntaxhighlight lang="amigae">PROC mean(l:PTR TO LONG) |
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DEF m, i, ll |
DEF m, i, ll |
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ll := ListLen(l) |
ll := ListLen(l) |
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=={{header|AntLang}}== |
=={{header|AntLang}}== |
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AntLang has a built-in avg function. |
AntLang has a built-in avg function. |
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<syntaxhighlight lang= |
<syntaxhighlight lang="antlang">avg[list]</syntaxhighlight> |
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=={{header|APL}}== |
=={{header|APL}}== |
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{{works with|APL2}} |
{{works with|APL2}} |
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<syntaxhighlight lang=apl> X←3 1 4 1 5 9 |
<syntaxhighlight lang="apl"> X←3 1 4 1 5 9 |
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(+/X)÷⍴X |
(+/X)÷⍴X |
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3.833333333</syntaxhighlight> |
3.833333333</syntaxhighlight> |
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With vanilla AppleScript, the process is the literal one of adding the numbers and dividing by the list length. It naturally returns results of class real, but it would be simple to return integer-representable results as integers if required. |
With vanilla AppleScript, the process is the literal one of adding the numbers and dividing by the list length. It naturally returns results of class real, but it would be simple to return integer-representable results as integers if required. |
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<syntaxhighlight lang=applescript>on average(listOfNumbers) |
<syntaxhighlight lang="applescript">on average(listOfNumbers) |
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set len to (count listOfNumbers) |
set len to (count listOfNumbers) |
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if (len is 0) then return missing value |
if (len is 0) then return missing value |
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The vanilla method above is the more efficient with lists of up to around 100 numbers. But for longer lists, using Foundation methods with AppleScriptObjectC can be useful |
The vanilla method above is the more efficient with lists of up to around 100 numbers. But for longer lists, using Foundation methods with AppleScriptObjectC can be useful |
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<syntaxhighlight lang=applescript>use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later |
<syntaxhighlight lang="applescript">use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later |
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use framework "Foundation" |
use framework "Foundation" |
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=={{header|Applesoft BASIC}}== |
=={{header|Applesoft BASIC}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="applesoftbasic">REM COLLECTION IN DATA STATEMENTS, EMPTY DATA IS THE END OF THE COLLECTION |
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0 READ V$ |
0 READ V$ |
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1 IF LEN(V$) = 0 THEN END |
1 IF LEN(V$) = 0 THEN END |
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=={{header|Arturo}}== |
=={{header|Arturo}}== |
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<syntaxhighlight lang=rebol>arr: [1 2 3 4 5 6 7] |
<syntaxhighlight lang="rebol">arr: [1 2 3 4 5 6 7] |
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print average arr</syntaxhighlight> |
print average arr</syntaxhighlight> |
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=={{header|Astro}}== |
=={{header|Astro}}== |
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<syntaxhighlight lang=astro>mean([1, 2, 3]) |
<syntaxhighlight lang="astro">mean([1, 2, 3]) |
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mean(1..10) |
mean(1..10) |
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mean([]) |
mean([]) |
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=={{header|AutoHotkey}}== |
=={{header|AutoHotkey}}== |
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<syntaxhighlight lang=autohotkey>i = 10 |
<syntaxhighlight lang="autohotkey">i = 10 |
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Loop, % i { |
Loop, % i { |
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Random, v, -3.141592, 3.141592 |
Random, v, -3.141592, 3.141592 |
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=={{header|AWK}}== |
=={{header|AWK}}== |
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<syntaxhighlight lang=awk>cat mean.awk |
<syntaxhighlight lang="awk">cat mean.awk |
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#!/usr/local/bin/gawk -f |
#!/usr/local/bin/gawk -f |
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=={{header|Babel}}== |
=={{header|Babel}}== |
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<syntaxhighlight lang=babel>(3 24 18 427 483 49 14 4294 2 41) dup len <- sum ! -> / itod <<</syntaxhighlight> |
<syntaxhighlight lang="babel">(3 24 18 427 483 49 14 4294 2 41) dup len <- sum ! -> / itod <<</syntaxhighlight> |
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{{Out}} |
{{Out}} |
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Assume the numbers are in an array named "nums". |
Assume the numbers are in an array named "nums". |
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<syntaxhighlight lang=qbasic>mean = 0 |
<syntaxhighlight lang="qbasic">mean = 0 |
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sum = 0; |
sum = 0; |
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FOR i = LBOUND(nums) TO UBOUND(nums) |
FOR i = LBOUND(nums) TO UBOUND(nums) |
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To calculate the mean of an array: |
To calculate the mean of an array: |
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<syntaxhighlight lang= |
<syntaxhighlight lang="bbc basic"> |
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REM specific functions for the array/vector types |
REM specific functions for the array/vector types |
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==={{header|IS-BASIC}}=== |
==={{header|IS-BASIC}}=== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="is-basic">100 NUMERIC ARR(3 TO 8) |
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110 LET ARR(3)=3:LET ARR(4)=1:LET ARR(5)=4:LET ARR(6)=1:LET ARR(7)=5:LET ARR(8)=9 |
110 LET ARR(3)=3:LET ARR(4)=1:LET ARR(5)=4:LET ARR(6)=1:LET ARR(7)=5:LET ARR(8)=9 |
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120 PRINT AM(ARR) |
120 PRINT AM(ARR) |
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=={{header|bc}}== |
=={{header|bc}}== |
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Uses the current scale for calculating the mean. |
Uses the current scale for calculating the mean. |
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<syntaxhighlight lang=bc>define m(a[], n) { |
<syntaxhighlight lang="bc">define m(a[], n) { |
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auto i, s |
auto i, s |
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=={{header|Befunge}}== |
=={{header|Befunge}}== |
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The first input is the length of the vector. If a length of 0 is entered, the result is equal to <code>0/0</code>. |
The first input is the length of the vector. If a length of 0 is entered, the result is equal to <code>0/0</code>. |
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<syntaxhighlight lang=befunge>&:0\:!v!:-1< |
<syntaxhighlight lang="befunge">&:0\:!v!:-1< |
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@./\$_\&+\^</syntaxhighlight> |
@./\$_\&+\^</syntaxhighlight> |
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=={{header|blz}}== |
=={{header|blz}}== |
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<syntaxhighlight lang=blz> |
<syntaxhighlight lang="blz"> |
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:mean(vec) |
:mean(vec) |
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vec.fold_left(0, (x, y -> x + y)) / vec.length() |
vec.fold_left(0, (x, y -> x + y)) / vec.length() |
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=={{header|Bracmat}}== |
=={{header|Bracmat}}== |
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Here are two solutions. The first uses a while loop, the second scans the input by backtracking. |
Here are two solutions. The first uses a while loop, the second scans the input by backtracking. |
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<syntaxhighlight lang=bracmat> |
<syntaxhighlight lang="bracmat"> |
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(mean1= |
(mean1= |
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sum length n |
sum length n |
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</syntaxhighlight> |
</syntaxhighlight> |
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To test with a list of all numbers 1 .. 999999: |
To test with a list of all numbers 1 .. 999999: |
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<syntaxhighlight lang=bracmat> |
<syntaxhighlight lang="bracmat"> |
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( :?test |
( :?test |
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& 1000000:?Length |
& 1000000:?Length |
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=={{header|Brat}}== |
=={{header|Brat}}== |
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<syntaxhighlight lang=brat>mean = { list | |
<syntaxhighlight lang="brat">mean = { list | |
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true? list.empty?, 0, { list.reduce(0, :+) / list.length } |
true? list.empty?, 0, { list.reduce(0, :+) / list.length } |
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} |
} |
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=={{header|Burlesque}}== |
=={{header|Burlesque}}== |
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<syntaxhighlight lang=burlesque> |
<syntaxhighlight lang="burlesque"> |
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blsq ) {1 2 2.718 3 3.142}av |
blsq ) {1 2 2.718 3 3.142}av |
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2.372 |
2.372 |
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Defines a tacit Avg function which works on any simple numeric list. |
Defines a tacit Avg function which works on any simple numeric list. |
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<syntaxhighlight lang=bqn>Avg ← +´÷≠ |
<syntaxhighlight lang="bqn">Avg ← +´÷≠ |
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Avg 1‿2‿3‿4</syntaxhighlight> |
Avg 1‿2‿3‿4</syntaxhighlight> |
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<lang>2.5</syntaxhighlight> |
<syntaxhighlight lang="text">2.5</syntaxhighlight> |
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[https://mlochbaum.github.io/BQN/try.html#code=QXZnIOKGkCArwrTDt+KJoAoKQXZnIDHigL8y4oC/M+KAvzQ= Try It!] |
[https://mlochbaum.github.io/BQN/try.html#code=QXZnIOKGkCArwrTDt+KJoAoKQXZnIDHigL8y4oC/M+KAvzQ= Try It!] |
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Compute mean of a <code>double</code> array of given length. If length is zero, does whatever <code>0.0/0</code> does (usually means returning <code>NaN</code>). |
Compute mean of a <code>double</code> array of given length. If length is zero, does whatever <code>0.0/0</code> does (usually means returning <code>NaN</code>). |
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<syntaxhighlight lang=c>#include <stdio.h> |
<syntaxhighlight lang="c">#include <stdio.h> |
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double mean(double *v, int len) |
double mean(double *v, int len) |
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=={{header|C sharp|C#}}== |
=={{header|C sharp|C#}}== |
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<syntaxhighlight lang=csharp>using System; |
<syntaxhighlight lang="csharp">using System; |
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using System.Linq; |
using System.Linq; |
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Alternative version (not using the built-in function): |
Alternative version (not using the built-in function): |
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<syntaxhighlight lang=csharp>using System; |
<syntaxhighlight lang="csharp">using System; |
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class Program |
class Program |
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=={{header|C++}}== |
=={{header|C++}}== |
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{{libheader|STL}} |
{{libheader|STL}} |
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<syntaxhighlight lang=cpp>#include <vector> |
<syntaxhighlight lang="cpp">#include <vector> |
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double mean(const std::vector<double>& numbers) |
double mean(const std::vector<double>& numbers) |
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Shorter (and more idiomatic) version: |
Shorter (and more idiomatic) version: |
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<syntaxhighlight lang=cpp>#include <vector> |
<syntaxhighlight lang="cpp">#include <vector> |
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#include <algorithm> |
#include <algorithm> |
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Idiomatic version templated on any kind of iterator: |
Idiomatic version templated on any kind of iterator: |
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<syntaxhighlight lang=cpp>#include <iterator> |
<syntaxhighlight lang="cpp">#include <iterator> |
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#include <algorithm> |
#include <algorithm> |
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=={{header|Chef}}== |
=={{header|Chef}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="chef">Mean. |
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Chef has no way to detect EOF, so rather than interpreting |
Chef has no way to detect EOF, so rather than interpreting |
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Returns a [http://clojure.org/data_structures ratio]: |
Returns a [http://clojure.org/data_structures ratio]: |
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<syntaxhighlight lang=lisp>(defn mean [sq] |
<syntaxhighlight lang="lisp">(defn mean [sq] |
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(if (empty? sq) |
(if (empty? sq) |
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0 |
0 |
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Returns a float: |
Returns a float: |
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<syntaxhighlight lang=lisp>(defn mean [sq] |
<syntaxhighlight lang="lisp">(defn mean [sq] |
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(if (empty? sq) |
(if (empty? sq) |
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0 |
0 |
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=={{header|COBOL}}== |
=={{header|COBOL}}== |
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Intrinsic function: |
Intrinsic function: |
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<syntaxhighlight lang=cobol>FUNCTION MEAN(some-table (ALL))</syntaxhighlight> |
<syntaxhighlight lang="cobol">FUNCTION MEAN(some-table (ALL))</syntaxhighlight> |
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Sample implementation: |
Sample implementation: |
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<syntaxhighlight lang=cobol> IDENTIFICATION DIVISION. |
<syntaxhighlight lang="cobol"> IDENTIFICATION DIVISION. |
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PROGRAM-ID. find-mean. |
PROGRAM-ID. find-mean. |
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=={{header|Cobra}}== |
=={{header|Cobra}}== |
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<syntaxhighlight lang=cobra> |
<syntaxhighlight lang="cobra"> |
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class Rosetta |
class Rosetta |
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def mean(ns as List<of number>) as number |
def mean(ns as List<of number>) as number |
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=={{header|CoffeeScript}}== |
=={{header|CoffeeScript}}== |
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<syntaxhighlight lang=coffeescript> |
<syntaxhighlight lang="coffeescript"> |
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mean = (array) -> |
mean = (array) -> |
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return 0 if array.length is 0 |
return 0 if array.length is 0 |
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'''With Reduce''' |
'''With Reduce''' |
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<syntaxhighlight lang=lisp>(defun mean (&rest sequence) |
<syntaxhighlight lang="lisp">(defun mean (&rest sequence) |
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(when sequence |
(when sequence |
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(/ (reduce #'+ sequence) (length sequence))))</syntaxhighlight> |
(/ (reduce #'+ sequence) (length sequence))))</syntaxhighlight> |
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'''With Loop''' |
'''With Loop''' |
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<syntaxhighlight lang=lisp>(defun mean (list) |
<syntaxhighlight lang="lisp">(defun mean (list) |
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(when list |
(when list |
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(/ (loop for i in list sum i) |
(/ (loop for i in list sum i) |
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Line 859: | Line 859: | ||
=={{header|Crystal}}== |
=={{header|Crystal}}== |
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<syntaxhighlight lang=ruby># Crystal will return NaN if an empty array is passed |
<syntaxhighlight lang="ruby"># Crystal will return NaN if an empty array is passed |
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def mean(arr) : Float64 |
def mean(arr) : Float64 |
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arr.sum / arr.size.to_f |
arr.sum / arr.size.to_f |
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=={{header|D}}== |
=={{header|D}}== |
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===Imperative Version=== |
===Imperative Version=== |
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<syntaxhighlight lang=d>real mean(Range)(Range r) pure nothrow @nogc { |
<syntaxhighlight lang="d">real mean(Range)(Range r) pure nothrow @nogc { |
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real sum = 0.0; |
real sum = 0.0; |
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int count; |
int count; |
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mean: 3.83333</pre> |
mean: 3.83333</pre> |
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===More Functional Version=== |
===More Functional Version=== |
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<syntaxhighlight lang=d>import std.stdio, std.algorithm, std.range; |
<syntaxhighlight lang="d">import std.stdio, std.algorithm, std.range; |
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real mean(Range)(Range r) pure nothrow @nogc { |
real mean(Range)(Range r) pure nothrow @nogc { |
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===More Precise Version=== |
===More Precise Version=== |
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A (naive?) version that tries to minimize precision loss (but already the sum algorithm applied to a random access range of floating point values uses a more precise summing strategy): |
A (naive?) version that tries to minimize precision loss (but already the sum algorithm applied to a random access range of floating point values uses a more precise summing strategy): |
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<syntaxhighlight lang=d>import std.stdio, std.conv, std.algorithm, std.math, std.traits; |
<syntaxhighlight lang="d">import std.stdio, std.conv, std.algorithm, std.math, std.traits; |
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CommonType!(T, real) mean(T)(T[] n ...) if (isNumeric!T) { |
CommonType!(T, real) mean(T)(T[] n ...) if (isNumeric!T) { |
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=={{header|Dart}}== |
=={{header|Dart}}== |
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<syntaxhighlight lang=d>num mean(List<num> l) => l.reduce((num p, num n) => p + n) / l.length; |
<syntaxhighlight lang="d">num mean(List<num> l) => l.reduce((num p, num n) => p + n) / l.length; |
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void main(){ |
void main(){ |
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This is not a translation of the bc solution. Array handling would add some complexity. This one-liner is similar to the K solution. |
This is not a translation of the bc solution. Array handling would add some complexity. This one-liner is similar to the K solution. |
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<syntaxhighlight lang=dc>1 2 3 5 7 zsn1k[+z1<+]ds+xln/p |
<syntaxhighlight lang="dc">1 2 3 5 7 zsn1k[+z1<+]ds+xln/p |
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3.6</syntaxhighlight> |
3.6</syntaxhighlight> |
||
An expanded example, identifying an empty sample set, could be created as a file, e.g., amean.cd: |
An expanded example, identifying an empty sample set, could be created as a file, e.g., amean.cd: |
||
<syntaxhighlight lang=dc>[[Nada Mean: ]Ppq]sq |
<syntaxhighlight lang="dc">[[Nada Mean: ]Ppq]sq |
||
zd0=qsn [stack length = n]sz |
zd0=qsn [stack length = n]sz |
||
1k [precision can be altered]sz |
1k [precision can be altered]sz |
||
Line 954: | Line 954: | ||
By saving the sample set "1 2 3 5 7" in a file (sample.dc), the routine, listing summary information, could be called in a command line: |
By saving the sample set "1 2 3 5 7" in a file (sample.dc), the routine, listing summary information, could be called in a command line: |
||
<syntaxhighlight lang=dc>$ dc sample.dc amean.cd |
<syntaxhighlight lang="dc">$ dc sample.dc amean.cd |
||
Sum: 18 |
Sum: 18 |
||
Mean: 3.6 |
Mean: 3.6 |
||
Line 961: | Line 961: | ||
=={{header|Delphi}}== |
=={{header|Delphi}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="delphi">program AveragesArithmeticMean; |
||
{$APPTYPE CONSOLE} |
{$APPTYPE CONSOLE} |
||
Line 986: | Line 986: | ||
=={{header|Dyalect}}== |
=={{header|Dyalect}}== |
||
<syntaxhighlight lang=dyalect>func avg(args...) { |
<syntaxhighlight lang="dyalect">func avg(args...) { |
||
var acc = .0 |
var acc = .0 |
||
var len = 0 |
var len = 0 |
||
Line 1,002: | Line 1,002: | ||
Slightly generalized to support any object that allows iteration. |
Slightly generalized to support any object that allows iteration. |
||
<syntaxhighlight lang=e>def meanOrZero(numbers) { |
<syntaxhighlight lang="e">def meanOrZero(numbers) { |
||
var count := 0 |
var count := 0 |
||
var sum := 0 |
var sum := 0 |
||
Line 1,013: | Line 1,013: | ||
=={{header|EasyLang}}== |
=={{header|EasyLang}}== |
||
<lang>func mean . f[] r . |
<syntaxhighlight lang="text">func mean . f[] r . |
||
for i range len f[] |
for i range len f[] |
||
s += f[i] |
s += f[i] |
||
Line 1,025: | Line 1,025: | ||
=={{header|EchoLisp}}== |
=={{header|EchoLisp}}== |
||
'''(mean values)''' is included in math.lib. values may be a list, vector, sequence, or any kind of procrastinator. |
'''(mean values)''' is included in math.lib. values may be a list, vector, sequence, or any kind of procrastinator. |
||
<syntaxhighlight lang=scheme> |
<syntaxhighlight lang="scheme"> |
||
(lib 'math) |
(lib 'math) |
||
(mean '(1 2 3 4)) ;; mean of a list |
(mean '(1 2 3 4)) ;; mean of a list |
||
Line 1,050: | Line 1,050: | ||
=={{header|ECL}}== |
=={{header|ECL}}== |
||
<syntaxhighlight lang=ecl> |
<syntaxhighlight lang="ecl"> |
||
AveVal(SET OF INTEGER s) := AVE(s); |
AveVal(SET OF INTEGER s) := AVE(s); |
||
Line 1,061: | Line 1,061: | ||
=={{header|Elena}}== |
=={{header|Elena}}== |
||
ELENA 5.0: |
ELENA 5.0: |
||
<syntaxhighlight lang=elena>import extensions; |
<syntaxhighlight lang="elena">import extensions; |
||
extension op |
extension op |
||
Line 1,095: | Line 1,095: | ||
=={{header|Elixir}}== |
=={{header|Elixir}}== |
||
<syntaxhighlight lang=elixir>defmodule Average do |
<syntaxhighlight lang="elixir">defmodule Average do |
||
def mean(list), do: Enum.sum(list) / length(list) |
def mean(list), do: Enum.sum(list) / length(list) |
||
end</syntaxhighlight> |
end</syntaxhighlight> |
||
=={{header|Emacs Lisp}}== |
=={{header|Emacs Lisp}}== |
||
<syntaxhighlight lang=lisp>(defun mean (lst) |
<syntaxhighlight lang="lisp">(defun mean (lst) |
||
(/ (float (apply '+ lst)) (length lst))) |
(/ (float (apply '+ lst)) (length lst))) |
||
(mean '(1 2 3 4))</syntaxhighlight> |
(mean '(1 2 3 4))</syntaxhighlight> |
||
Line 1,106: | Line 1,106: | ||
{{libheader|Calc}} |
{{libheader|Calc}} |
||
<syntaxhighlight lang=lisp>(let ((x '(1 2 3 4))) |
<syntaxhighlight lang="lisp">(let ((x '(1 2 3 4))) |
||
(calc-eval "vmean($1)" nil (append '(vec) x)))</syntaxhighlight> |
(calc-eval "vmean($1)" nil (append '(vec) x)))</syntaxhighlight> |
||
=={{header|Erlang}}== |
=={{header|Erlang}}== |
||
<syntaxhighlight lang=erlang>mean([]) -> 0; |
<syntaxhighlight lang="erlang">mean([]) -> 0; |
||
mean(L) -> lists:sum(L)/erlang:length(L).</syntaxhighlight> |
mean(L) -> lists:sum(L)/erlang:length(L).</syntaxhighlight> |
||
=={{header|Euphoria}}== |
=={{header|Euphoria}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="euphoria">function mean(sequence s) |
||
atom sum |
atom sum |
||
if length(s) = 0 then |
if length(s) = 0 then |
||
Line 1,134: | Line 1,134: | ||
Assuming the values are entered in the A column, type into any cell which will not be part of the list: |
Assuming the values are entered in the A column, type into any cell which will not be part of the list: |
||
<syntaxhighlight lang=excel>=AVERAGE(A1:A10)</syntaxhighlight> |
<syntaxhighlight lang="excel">=AVERAGE(A1:A10)</syntaxhighlight> |
||
Assuming 10 values will be entered, alternatively, you can just type: |
Assuming 10 values will be entered, alternatively, you can just type: |
||
<syntaxhighlight lang=excel>=AVERAGE(</syntaxhighlight> |
<syntaxhighlight lang="excel">=AVERAGE(</syntaxhighlight> |
||
and then select the start and end cells, not necessarily in the same row or column. |
and then select the start and end cells, not necessarily in the same row or column. |
||
Line 1,159: | Line 1,159: | ||
=={{header|F_Sharp|F#}}== |
=={{header|F_Sharp|F#}}== |
||
The following computes the running mean using a tail-recursive approach. If we just sum all the values then divide by the number of values then we will suffer from overflow problems for large lists. See [[wp:Moving_average|wikipedia]] about the moving average computation. |
The following computes the running mean using a tail-recursive approach. If we just sum all the values then divide by the number of values then we will suffer from overflow problems for large lists. See [[wp:Moving_average|wikipedia]] about the moving average computation. |
||
<syntaxhighlight lang=fsharp>let avg (a:float) (v:float) n = |
<syntaxhighlight lang="fsharp">let avg (a:float) (v:float) n = |
||
a + (1. / ((float n) + 1.)) * (v - a) |
a + (1. / ((float n) + 1.)) * (v - a) |
||
Line 1,167: | Line 1,167: | ||
Checking this: |
Checking this: |
||
<syntaxhighlight lang=fsharp> > mean_series [1; 8; 2; 8; 1; 7; 1; 8; 2; 7; 3; 6; 1; 8; 100] ;; |
<syntaxhighlight lang="fsharp"> > mean_series [1; 8; 2; 8; 1; 7; 1; 8; 2; 7; 3; 6; 1; 8; 100] ;; |
||
val it : float = 10.86666667 |
val it : float = 10.86666667 |
||
> mean_series [] ;; |
> mean_series [] ;; |
||
Line 1,173: | Line 1,173: | ||
We can also make do with the built-in ''List.average'' function: |
We can also make do with the built-in ''List.average'' function: |
||
<syntaxhighlight lang=fsharp>List.average [4;1;7;5;8;4;5;2;1;5;2;5]</syntaxhighlight> |
<syntaxhighlight lang="fsharp">List.average [4;1;7;5;8;4;5;2;1;5;2;5]</syntaxhighlight> |
||
=={{header|Factor}}== |
=={{header|Factor}}== |
||
<syntaxhighlight lang=factor>USING: math math.statistics ; |
<syntaxhighlight lang="factor">USING: math math.statistics ; |
||
: arithmetic-mean ( seq -- n ) |
: arithmetic-mean ( seq -- n ) |
||
Line 1,183: | Line 1,183: | ||
Tests: |
Tests: |
||
<syntaxhighlight lang=factor>( scratchpad ) { 2 3 5 } arithmetic-mean >float |
<syntaxhighlight lang="factor">( scratchpad ) { 2 3 5 } arithmetic-mean >float |
||
3.333333333333333</syntaxhighlight> |
3.333333333333333</syntaxhighlight> |
||
=={{header|Fantom}}== |
=={{header|Fantom}}== |
||
<syntaxhighlight lang=fantom> |
<syntaxhighlight lang="fantom"> |
||
class Main |
class Main |
||
{ |
{ |
||
Line 1,210: | Line 1,210: | ||
=={{header|Fish}}== |
=={{header|Fish}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="fish">!vl0=?vl1=?vl&! |
||
v< +<>0n; >n; |
v< +<>0n; >n; |
||
>l1)?^&,n;</syntaxhighlight> |
>l1)?^&,n;</syntaxhighlight> |
||
Line 1,219: | Line 1,219: | ||
=={{header|Forth}}== |
=={{header|Forth}}== |
||
<syntaxhighlight lang=forth>: fmean ( addr n -- f ) |
<syntaxhighlight lang="forth">: fmean ( addr n -- f ) |
||
0e |
0e |
||
dup 0= if 2drop exit then |
dup 0= if 2drop exit then |
||
Line 1,232: | Line 1,232: | ||
=={{header|Fortran}}== |
=={{header|Fortran}}== |
||
In ISO Fortran 90 or later, use the SUM intrinsic, the SIZE intrinsic and the MAX intrinsic (to avoid divide by zero): |
In ISO Fortran 90 or later, use the SUM intrinsic, the SIZE intrinsic and the MAX intrinsic (to avoid divide by zero): |
||
<syntaxhighlight lang=fortran>real, target, dimension(100) :: a = (/ (i, i=1, 100) /) |
<syntaxhighlight lang="fortran">real, target, dimension(100) :: a = (/ (i, i=1, 100) /) |
||
real, dimension(5,20) :: b = reshape( a, (/ 5,20 /) ) |
real, dimension(5,20) :: b = reshape( a, (/ 5,20 /) ) |
||
real, pointer, dimension(:) :: p => a(2:1) ! pointer to zero-length array |
real, pointer, dimension(:) :: p => a(2:1) ! pointer to zero-length array |
||
Line 1,254: | Line 1,254: | ||
=={{header|FreeBASIC}}== |
=={{header|FreeBASIC}}== |
||
<syntaxhighlight lang=freebasic> |
<syntaxhighlight lang="freebasic"> |
||
' FB 1.05.0 Win64 |
' FB 1.05.0 Win64 |
||
Line 1,319: | Line 1,319: | ||
=={{header|Frink}}== |
=={{header|Frink}}== |
||
The following works on arrays or sets. If the collection is empty, this returns the special value <CODE>undef</CODE>. |
The following works on arrays or sets. If the collection is empty, this returns the special value <CODE>undef</CODE>. |
||
<syntaxhighlight lang=frink> |
<syntaxhighlight lang="frink"> |
||
mean[x] := length[x] > 0 ? sum[x] / length[x] : undef |
mean[x] := length[x] > 0 ? sum[x] / length[x] : undef |
||
</syntaxhighlight> |
</syntaxhighlight> |
||
=={{header|GAP}}== |
=={{header|GAP}}== |
||
<syntaxhighlight lang=gap>Mean := function(v) |
<syntaxhighlight lang="gap">Mean := function(v) |
||
local n; |
local n; |
||
n := Length(v); |
n := Length(v); |
||
Line 1,338: | Line 1,338: | ||
=={{header|GEORGE}}== |
=={{header|GEORGE}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="george">R (n) P ; |
||
0 |
0 |
||
1, n rep (i) |
1, n rep (i) |
||
Line 1,364: | Line 1,364: | ||
This works for arrays of integers. |
This works for arrays of integers. |
||
<lang> |
<syntaxhighlight lang="text"> |
||
DIM a%(10) |
DIM a%(10) |
||
FOR i%=0 TO 10 |
FOR i%=0 TO 10 |
||
Line 1,393: | Line 1,393: | ||
A little more elaborate that the task requires. The function "mean" fulfills the task of "a program to find the mean." As a Go idiom, it returns an ok value of true if result m is valid. An ok value of false means the input "vector" (a Go slice) was empty. The fancy accuracy preserving algorithm is a little more than was called more. The program main is a test program demonstrating the ok idiom and several data cases. |
A little more elaborate that the task requires. The function "mean" fulfills the task of "a program to find the mean." As a Go idiom, it returns an ok value of true if result m is valid. An ok value of false means the input "vector" (a Go slice) was empty. The fancy accuracy preserving algorithm is a little more than was called more. The program main is a test program demonstrating the ok idiom and several data cases. |
||
<syntaxhighlight lang=go>package main |
<syntaxhighlight lang="go">package main |
||
import ( |
import ( |
||
Line 1,483: | Line 1,483: | ||
=={{header|Groovy}}== |
=={{header|Groovy}}== |
||
<syntaxhighlight lang=groovy>def avg = { list -> list == [] ? 0 : list.sum() / list.size() }</syntaxhighlight> |
<syntaxhighlight lang="groovy">def avg = { list -> list == [] ? 0 : list.sum() / list.size() }</syntaxhighlight> |
||
Test Program: |
Test Program: |
||
<syntaxhighlight lang=groovy>println avg(0..9) |
<syntaxhighlight lang="groovy">println avg(0..9) |
||
println avg([2,2,2,4,2]) |
println avg([2,2,2,4,2]) |
||
println avg ([])</syntaxhighlight> |
println avg ([])</syntaxhighlight> |
||
Line 1,497: | Line 1,497: | ||
=={{header|Haskell}}== |
=={{header|Haskell}}== |
||
This function works if the element type is an instance of Fractional: |
This function works if the element type is an instance of Fractional: |
||
<syntaxhighlight lang=haskell>mean :: (Fractional a) => [a] -> a |
<syntaxhighlight lang="haskell">mean :: (Fractional a) => [a] -> a |
||
mean [] = 0 |
mean [] = 0 |
||
mean xs = sum xs / Data.List.genericLength xs</syntaxhighlight> |
mean xs = sum xs / Data.List.genericLength xs</syntaxhighlight> |
||
But some types, e.g. integers, are not Fractional; the following function works for all Real types: |
But some types, e.g. integers, are not Fractional; the following function works for all Real types: |
||
<syntaxhighlight lang=haskell>meanReals :: (Real a, Fractional b) => [a] -> b |
<syntaxhighlight lang="haskell">meanReals :: (Real a, Fractional b) => [a] -> b |
||
meanReals = mean . map realToFrac</syntaxhighlight> |
meanReals = mean . map realToFrac</syntaxhighlight> |
||
If you want to avoid keeping the list in memory and traversing it twice: |
If you want to avoid keeping the list in memory and traversing it twice: |
||
<syntaxhighlight lang=haskell>{-# LANGUAGE BangPatterns #-} |
<syntaxhighlight lang="haskell">{-# LANGUAGE BangPatterns #-} |
||
import Data.List (foldl') --' |
import Data.List (foldl') --' |
||
Line 1,528: | Line 1,528: | ||
=={{header|HicEst}}== |
=={{header|HicEst}}== |
||
<syntaxhighlight lang=hicest>REAL :: vec(100) ! no zero-length arrays in HicEst |
<syntaxhighlight lang="hicest">REAL :: vec(100) ! no zero-length arrays in HicEst |
||
vec = $ - 1/2 ! 0.5 ... 99.5 |
vec = $ - 1/2 ! 0.5 ... 99.5 |
||
Line 1,536: | Line 1,536: | ||
=={{header|Hy}}== |
=={{header|Hy}}== |
||
Returns <tt>None</tt> if the input is of length zero. |
Returns <tt>None</tt> if the input is of length zero. |
||
<syntaxhighlight lang=clojure>(defn arithmetic-mean [xs] |
<syntaxhighlight lang="clojure">(defn arithmetic-mean [xs] |
||
(if xs |
(if xs |
||
(/ (sum xs) (len xs))))</syntaxhighlight> |
(/ (sum xs) (len xs))))</syntaxhighlight> |
||
=={{header|Icon}} and {{header|Unicon}}== |
=={{header|Icon}} and {{header|Unicon}}== |
||
<syntaxhighlight lang=icon>procedure main(args) |
<syntaxhighlight lang="icon">procedure main(args) |
||
every (s := 0) +:= !args |
every (s := 0) +:= !args |
||
write((real(s)/(0 ~= *args)) | 0) |
write((real(s)/(0 ~= *args)) | 0) |
||
Line 1,557: | Line 1,557: | ||
If truly only the mean is wanted, one could use |
If truly only the mean is wanted, one could use |
||
<syntaxhighlight lang=idl>x = [3,1,4,1,5,9] |
<syntaxhighlight lang="idl">x = [3,1,4,1,5,9] |
||
print,mean(x)</syntaxhighlight> |
print,mean(x)</syntaxhighlight> |
||
But <tt>mean()</tt> is just a thin wrapper returning the zeroth element of <tt>moment()</tt> : |
But <tt>mean()</tt> is just a thin wrapper returning the zeroth element of <tt>moment()</tt> : |
||
<syntaxhighlight lang=idl>print,moment(x) |
<syntaxhighlight lang="idl">print,moment(x) |
||
; ==> |
; ==> |
||
3.83333 8.96667 0.580037 -1.25081</syntaxhighlight> |
3.83333 8.96667 0.580037 -1.25081</syntaxhighlight> |
||
Line 1,572: | Line 1,572: | ||
=={{header|J}}== |
=={{header|J}}== |
||
<syntaxhighlight lang=j>mean=: +/ % #</syntaxhighlight> |
<syntaxhighlight lang="j">mean=: +/ % #</syntaxhighlight> |
||
That is, sum divided by the number of items. The verb also works on higher-ranked arrays. For example: |
That is, sum divided by the number of items. The verb also works on higher-ranked arrays. For example: |
||
<syntaxhighlight lang=j> mean 3 1 4 1 5 9 |
<syntaxhighlight lang="j"> mean 3 1 4 1 5 9 |
||
3.83333 |
3.83333 |
||
mean $0 NB. $0 is a zero-length vector |
mean $0 NB. $0 is a zero-length vector |
||
Line 1,586: | Line 1,586: | ||
The computation can also be written as a loop. It is shown here for comparison only and is highly non-preferred compared to the version above. |
The computation can also be written as a loop. It is shown here for comparison only and is highly non-preferred compared to the version above. |
||
<syntaxhighlight lang=j>mean1=: 3 : 0 |
<syntaxhighlight lang="j">mean1=: 3 : 0 |
||
z=. 0 |
z=. 0 |
||
for_i. i.#y do. z=. z+i{y end. |
for_i. i.#y do. z=. z+i{y end. |
||
Line 1,601: | Line 1,601: | ||
{{works with|Java|1.5+}} |
{{works with|Java|1.5+}} |
||
<syntaxhighlight lang=java5>public static double avg(double... arr) { |
<syntaxhighlight lang="java5">public static double avg(double... arr) { |
||
double sum = 0.0; |
double sum = 0.0; |
||
for (double x : arr) { |
for (double x : arr) { |
||
Line 1,613: | Line 1,613: | ||
===ES5=== |
===ES5=== |
||
<syntaxhighlight lang=javascript>function mean(array) |
<syntaxhighlight lang="javascript">function mean(array) |
||
{ |
{ |
||
var sum = 0, i; |
var sum = 0, i; |
||
Line 1,627: | Line 1,627: | ||
Using the native function `.forEach()`: |
Using the native function `.forEach()`: |
||
<syntaxhighlight lang=javascript>function mean(array) { |
<syntaxhighlight lang="javascript">function mean(array) { |
||
var sum = 0; |
var sum = 0; |
||
array.forEach(function(value){ |
array.forEach(function(value){ |
||
Line 1,638: | Line 1,638: | ||
Using the native function `.reduce()`: |
Using the native function `.reduce()`: |
||
<syntaxhighlight lang=javascript>function mean(array) { |
<syntaxhighlight lang="javascript">function mean(array) { |
||
return !array.length ? 0 |
return !array.length ? 0 |
||
: array.reduce(function(pre, cur, i) { |
: array.reduce(function(pre, cur, i) { |
||
Line 1,650: | Line 1,650: | ||
Extending the `Array` prototype: |
Extending the `Array` prototype: |
||
<syntaxhighlight lang=javascript>Array.prototype.mean = function() { |
<syntaxhighlight lang="javascript">Array.prototype.mean = function() { |
||
return !this.length ? 0 |
return !this.length ? 0 |
||
: this.reduce(function(pre, cur, i) { |
: this.reduce(function(pre, cur, i) { |
||
Line 1,663: | Line 1,663: | ||
{{libheader|Functional}} |
{{libheader|Functional}} |
||
<syntaxhighlight lang=javascript>function mean(a) |
<syntaxhighlight lang="javascript">function mean(a) |
||
{ |
{ |
||
return a.length ? Functional.reduce('+', 0, a) / a.length : 0; |
return a.length ? Functional.reduce('+', 0, a) / a.length : 0; |
||
Line 1,671: | Line 1,671: | ||
===ES6=== |
===ES6=== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="javascript">(sample => { |
||
// mean :: [Num] => (Num | NaN) |
// mean :: [Num] => (Num | NaN) |
||
Line 1,687: | Line 1,687: | ||
{{Out}} |
{{Out}} |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="javascript">5</syntaxhighlight> |
||
=={{header|jq}}== |
=={{header|jq}}== |
||
The mean of an array of numbers can be computed by simply writing |
The mean of an array of numbers can be computed by simply writing |
||
<syntaxhighlight lang=jq>add/length</syntaxhighlight> |
<syntaxhighlight lang="jq">add/length</syntaxhighlight> |
||
This definition raises an error condition if the array is empty, so it may make sense to define '''mean''' as follows, '''null''' being jq's null value: |
This definition raises an error condition if the array is empty, so it may make sense to define '''mean''' as follows, '''null''' being jq's null value: |
||
<syntaxhighlight lang=jq>def mean: if length == 0 then null |
<syntaxhighlight lang="jq">def mean: if length == 0 then null |
||
else add/length |
else add/length |
||
end;</syntaxhighlight> |
end;</syntaxhighlight> |
||
Line 1,700: | Line 1,700: | ||
=={{header|Julia}}== |
=={{header|Julia}}== |
||
Julia's built-in mean function accepts AbstractArrays (vector, matrix, etc.) |
Julia's built-in mean function accepts AbstractArrays (vector, matrix, etc.) |
||
<syntaxhighlight lang=julia>julia> using Statistics; mean([1,2,3]) |
<syntaxhighlight lang="julia">julia> using Statistics; mean([1,2,3]) |
||
2.0 |
2.0 |
||
julia> mean(1:10) |
julia> mean(1:10) |
||
Line 1,708: | Line 1,708: | ||
=={{header|K}}== |
=={{header|K}}== |
||
<syntaxhighlight lang=k> mean: {(+/x)%#x} |
<syntaxhighlight lang="k"> mean: {(+/x)%#x} |
||
mean 1 2 3 5 7 |
mean 1 2 3 5 7 |
||
3.6 |
3.6 |
||
Line 1,717: | Line 1,717: | ||
Kotlin has builtin functions for some collection types. |
Kotlin has builtin functions for some collection types. |
||
Example: |
Example: |
||
<syntaxhighlight lang=scala>fun main(args: Array<String>) { |
<syntaxhighlight lang="scala">fun main(args: Array<String>) { |
||
val nums = doubleArrayOf(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0) |
val nums = doubleArrayOf(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0) |
||
println("average = %f".format(nums.average())) |
println("average = %f".format(nums.average())) |
||
Line 1,723: | Line 1,723: | ||
=={{header|KQL}}== |
=={{header|KQL}}== |
||
<syntaxhighlight lang=kql> |
<syntaxhighlight lang="kql"> |
||
let dataset = datatable(values:real)[ |
let dataset = datatable(values:real)[ |
||
1, 1.5, 3, 5, 6.5]; |
1, 1.5, 3, 5, 6.5]; |
||
Line 1,741: | Line 1,741: | ||
=={{header|Lambdatalk}}== |
=={{header|Lambdatalk}}== |
||
<syntaxhighlight lang=scheme> |
<syntaxhighlight lang="scheme"> |
||
{def mean |
{def mean |
||
{lambda {:s} |
{lambda {:s} |
||
Line 1,758: | Line 1,758: | ||
{{works with|langur|0.6.6}} |
{{works with|langur|0.6.6}} |
||
<syntaxhighlight lang=langur>val .mean = f(.x) fold(f{+}, .x) / len(.x) |
<syntaxhighlight lang="langur">val .mean = f(.x) fold(f{+}, .x) / len(.x) |
||
writeln " custom: ", .mean([7, 3, 12]) |
writeln " custom: ", .mean([7, 3, 12]) |
||
Line 1,768: | Line 1,768: | ||
=={{header|Lasso}}== |
=={{header|Lasso}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="lasso">define average(a::array) => { |
||
not #a->size ? return 0 |
not #a->size ? return 0 |
||
local(x = 0.0) |
local(x = 0.0) |
||
Line 1,781: | Line 1,781: | ||
=== 1-Arity === |
=== 1-Arity === |
||
<syntaxhighlight lang=lisp> |
<syntaxhighlight lang="lisp"> |
||
(defun mean (data) |
(defun mean (data) |
||
(/ (lists:sum data) |
(/ (lists:sum data) |
||
Line 1,788: | Line 1,788: | ||
Usage: |
Usage: |
||
<syntaxhighlight lang=lisp>> (mean '(1 1)) |
<syntaxhighlight lang="lisp">> (mean '(1 1)) |
||
1.0 |
1.0 |
||
> (mean '(1 2)) |
> (mean '(1 2)) |
||
Line 1,801: | Line 1,801: | ||
Functions in LFE (and Erlang) have set arity, but macros can be used to provide the same use as n-arity functions: |
Functions in LFE (and Erlang) have set arity, but macros can be used to provide the same use as n-arity functions: |
||
<syntaxhighlight lang=lisp>(defmacro mean args |
<syntaxhighlight lang="lisp">(defmacro mean args |
||
`(/ (lists:sum ,args) |
`(/ (lists:sum ,args) |
||
,(length args)))</syntaxhighlight> |
,(length args)))</syntaxhighlight> |
||
Line 1,807: | Line 1,807: | ||
Usage: |
Usage: |
||
<syntaxhighlight lang=lisp>> (mean 42) |
<syntaxhighlight lang="lisp">> (mean 42) |
||
42.0 |
42.0 |
||
> (mean 18 66) |
> (mean 18 66) |
||
Line 1,815: | Line 1,815: | ||
=={{header|Liberty BASIC}}== |
=={{header|Liberty BASIC}}== |
||
<syntaxhighlight lang=lb>total=17 |
<syntaxhighlight lang="lb">total=17 |
||
dim nums(total) |
dim nums(total) |
||
for i = 1 to total |
for i = 1 to total |
||
Line 1,829: | Line 1,829: | ||
=={{header|Limbo}}== |
=={{header|Limbo}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="limbo">implement Command; |
||
include "sys.m"; |
include "sys.m"; |
||
Line 1,855: | Line 1,855: | ||
=={{header|Lingo}}== |
=={{header|Lingo}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="lingo">-- v can be (2D) point, (3D) vector or list of integers/floats |
||
on mean (v) |
on mean (v) |
||
case ilk(v) of |
case ilk(v) of |
||
Line 1,870: | Line 1,870: | ||
end</syntaxhighlight> |
end</syntaxhighlight> |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="lingo">put mean(point(1, 2.5)) |
||
-- 1.7500 |
-- 1.7500 |
||
put mean(vector(1.2, 4.7, 5.6)) |
put mean(vector(1.2, 4.7, 5.6)) |
||
Line 1,879: | Line 1,879: | ||
=={{header|LiveCode}}== |
=={{header|LiveCode}}== |
||
Livecode provides arithmeticMean (avg, average) built-in. |
Livecode provides arithmeticMean (avg, average) built-in. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="livecode">average(1,2,3,4,5) -- 3 |
||
average(empty) -- 0</syntaxhighlight> |
average(empty) -- 0</syntaxhighlight> |
||
=={{header|Logo}}== |
=={{header|Logo}}== |
||
<syntaxhighlight lang=logo>to average :l |
<syntaxhighlight lang="logo">to average :l |
||
if empty? :l [output 0] |
if empty? :l [output 0] |
||
output quotient apply "sum :l count :l |
output quotient apply "sum :l count :l |
||
Line 1,891: | Line 1,891: | ||
=={{header|Logtalk}}== |
=={{header|Logtalk}}== |
||
Logtalk's standard library provides an arithmetic average predicate but we ignore it here. Representing a vector using a list: |
Logtalk's standard library provides an arithmetic average predicate but we ignore it here. Representing a vector using a list: |
||
<syntaxhighlight lang=logtalk> |
<syntaxhighlight lang="logtalk"> |
||
:- object(averages). |
:- object(averages). |
||
Line 1,911: | Line 1,911: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
Sample output: |
Sample output: |
||
<syntaxhighlight lang=text> |
<syntaxhighlight lang="text"> |
||
| ?- averages::arithmetic([1,2,3,4,5,6,7,8,9,10], Mean). |
| ?- averages::arithmetic([1,2,3,4,5,6,7,8,9,10], Mean). |
||
Mean = 5.5 |
Mean = 5.5 |
||
Line 1,918: | Line 1,918: | ||
=={{header|LSL}}== |
=={{header|LSL}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="lsl">integer MAX_ELEMENTS = 10; |
||
integer MAX_VALUE = 100; |
integer MAX_VALUE = 100; |
||
default { |
default { |
||
Line 1,956: | Line 1,956: | ||
=={{header|Lua}}== |
=={{header|Lua}}== |
||
<syntaxhighlight lang=lua>function mean (numlist) |
<syntaxhighlight lang="lua">function mean (numlist) |
||
if type(numlist) ~= 'table' then return numlist end |
if type(numlist) ~= 'table' then return numlist end |
||
num = 0 |
num = 0 |
||
Line 1,967: | Line 1,967: | ||
=={{header|Lucid}}== |
=={{header|Lucid}}== |
||
<syntaxhighlight lang=lucid>avg(x) |
<syntaxhighlight lang="lucid">avg(x) |
||
where |
where |
||
sum = first(x) fby sum + next(x); |
sum = first(x) fby sum + next(x); |
||
Line 1,980: | Line 1,980: | ||
directly, but it is a little bit clearer to keep them separated. |
directly, but it is a little bit clearer to keep them separated. |
||
<syntaxhighlight lang=m4>define(`extractdec', `ifelse(eval(`$1%100 < 10'),1,`0',`')eval($1%100)')dnl |
<syntaxhighlight lang="m4">define(`extractdec', `ifelse(eval(`$1%100 < 10'),1,`0',`')eval($1%100)')dnl |
||
define(`fmean', `eval(`($2/$1)/100').extractdec(eval(`$2/$1'))')dnl |
define(`fmean', `eval(`($2/$1)/100').extractdec(eval(`$2/$1'))')dnl |
||
define(`mean', `rmean(`$#', $@)')dnl |
define(`mean', `rmean(`$#', $@)')dnl |
||
define(`rmean', `ifelse(`$3', `', `fmean($1,$2)',dnl |
define(`rmean', `ifelse(`$3', `', `fmean($1,$2)',dnl |
||
`rmean($1, eval($2+$3), shift(shift(shift($@))))')')dnl</syntaxhighlight> |
`rmean($1, eval($2+$3), shift(shift(shift($@))))')')dnl</syntaxhighlight> |
||
<syntaxhighlight lang=m4>mean(0,100,200,300,400,500,600,700,800,900,1000)</syntaxhighlight> |
<syntaxhighlight lang="m4">mean(0,100,200,300,400,500,600,700,800,900,1000)</syntaxhighlight> |
||
=={{header|Maple}}== |
=={{header|Maple}}== |
||
This version accepts any indexable structure, including numeric arrays. We use a call to the "environment variable" (dynamically scoped global) "Normalizer" to provide normalization of symbolic expressions. This can be set by the caller to adjust the strength of normalization desired. |
This version accepts any indexable structure, including numeric arrays. We use a call to the "environment variable" (dynamically scoped global) "Normalizer" to provide normalization of symbolic expressions. This can be set by the caller to adjust the strength of normalization desired. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="maple"> |
||
mean := proc( a :: indexable ) |
mean := proc( a :: indexable ) |
||
local i; |
local i; |
||
Line 1,996: | Line 1,996: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
For example: |
For example: |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="maple"> |
||
> mean( { 1/2, 2/3, 3/4, 4/5, 5/6 } ); # set |
> mean( { 1/2, 2/3, 3/4, 4/5, 5/6 } ); # set |
||
71 |
71 |
||
Line 2,020: | Line 2,020: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
A slightly different design computes the mean of all its arguments, instead of requiring a single container argument. This seems a little more Maple-like for a general purpose utility. |
A slightly different design computes the mean of all its arguments, instead of requiring a single container argument. This seems a little more Maple-like for a general purpose utility. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="maple">mean := () -> Normalizer( `+`( args ) / nargs ):</syntaxhighlight> |
||
This can be called as in the following examples. |
This can be called as in the following examples. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="maple"> |
||
> mean( 1, 2, 3, 4, 5 ); |
> mean( 1, 2, 3, 4, 5 ); |
||
3 |
3 |
||
Line 2,035: | Line 2,035: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
If desired, we can add argument type-checking as follows. |
If desired, we can add argument type-checking as follows. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="maple">mean := ( s :: seq(algebraic) ) -> Normalizer( `+`( args ) / nargs ):</syntaxhighlight> |
||
=={{header|Mathematica}} / {{header|Wolfram Language}}== |
=={{header|Mathematica}} / {{header|Wolfram Language}}== |
||
Modify the built-in Mean function to give 0 for empty vectors (lists in Mathematica): |
Modify the built-in Mean function to give 0 for empty vectors (lists in Mathematica): |
||
<syntaxhighlight lang=mathematica>Unprotect[Mean]; |
<syntaxhighlight lang="mathematica">Unprotect[Mean]; |
||
Mean[{}] := 0</syntaxhighlight> |
Mean[{}] := 0</syntaxhighlight> |
||
Examples: |
Examples: |
||
<syntaxhighlight lang=mathematica>Mean[{3,4,5}] |
<syntaxhighlight lang="mathematica">Mean[{3,4,5}] |
||
Mean[{3.2,4.5,5.9}] |
Mean[{3.2,4.5,5.9}] |
||
Mean[{-4, 1.233}] |
Mean[{-4, 1.233}] |
||
Line 2,049: | Line 2,049: | ||
Mean[{a,c,Pi,-3,a}]</syntaxhighlight> |
Mean[{a,c,Pi,-3,a}]</syntaxhighlight> |
||
gives (a set of integers gives back an integer or a rational, a set of floats gives back a float, a set of rationals gives a rational back, a list of symbols and numbers keeps the symbols exact and a mix of exact and approximate numbers gives back an approximate number): |
gives (a set of integers gives back an integer or a rational, a set of floats gives back a float, a set of rationals gives a rational back, a list of symbols and numbers keeps the symbols exact and a mix of exact and approximate numbers gives back an approximate number): |
||
<syntaxhighlight lang=mathematica>4 |
<syntaxhighlight lang="mathematica">4 |
||
4.53333 |
4.53333 |
||
-1.3835 |
-1.3835 |
||
Line 2,066: | Line 2,066: | ||
To make it more interesting I find the Arithmectic Mean of more than a million Integers. |
To make it more interesting I find the Arithmectic Mean of more than a million Integers. |
||
<lang> |
<syntaxhighlight lang="text"> |
||
/*Arithmetic Mean of a large number of Integers |
/*Arithmetic Mean of a large number of Integers |
||
- or - solve a very large constraint matrix |
- or - solve a very large constraint matrix |
||
Line 2,095: | Line 2,095: | ||
When run this produces: |
When run this produces: |
||
<lang> |
<syntaxhighlight lang="text"> |
||
GLPSOL: GLPK LP/MIP Solver, v4.47 |
GLPSOL: GLPK LP/MIP Solver, v4.47 |
||
Parameter(s) specified in the command line: |
Parameter(s) specified in the command line: |
||
Line 2,121: | Line 2,121: | ||
=={{header|MATLAB}}== |
=={{header|MATLAB}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="matlab">function meanValue = findmean(setOfValues) |
||
meanValue = mean(setOfValues); |
meanValue = mean(setOfValues); |
||
end</syntaxhighlight> |
end</syntaxhighlight> |
||
=={{header|Maxima}}== |
=={{header|Maxima}}== |
||
<syntaxhighlight lang=maxima>load("descriptive"); |
<syntaxhighlight lang="maxima">load("descriptive"); |
||
mean([2, 7, 11, 17]);</syntaxhighlight> |
mean([2, 7, 11, 17]);</syntaxhighlight> |
||
=={{header|MAXScript}}== |
=={{header|MAXScript}}== |
||
<syntaxhighlight lang=maxscript>fn mean data = |
<syntaxhighlight lang="maxscript">fn mean data = |
||
( |
( |
||
total = 0 |
total = 0 |
||
Line 2,143: | Line 2,143: | ||
=={{header|Mercury}}== |
=={{header|Mercury}}== |
||
<syntaxhighlight lang=mercury>:- module arithmetic_mean. |
<syntaxhighlight lang="mercury">:- module arithmetic_mean. |
||
:- interface. |
:- interface. |
||
Line 2,167: | Line 2,167: | ||
mean function is called with an empty list. |
mean function is called with an empty list. |
||
<syntaxhighlight lang=mercury>:- func mean(list(float)::in(non_empty_list)) = (float::out). |
<syntaxhighlight lang="mercury">:- func mean(list(float)::in(non_empty_list)) = (float::out). |
||
mean(Ns) = foldl((+), Ns, 0.0) / float(length(Ns)).</syntaxhighlight> |
mean(Ns) = foldl((+), Ns, 0.0) / float(length(Ns)).</syntaxhighlight> |
||
Line 2,174: | Line 2,174: | ||
Returns <code>nan</code> for an empty quotation. |
Returns <code>nan</code> for an empty quotation. |
||
{{works with|min|0.19.3}} |
{{works with|min|0.19.3}} |
||
<syntaxhighlight lang=min>(((0 (+) reduce) (size /)) cleave) :mean |
<syntaxhighlight lang="min">(((0 (+) reduce) (size /)) cleave) :mean |
||
(2 3 5) mean print</syntaxhighlight> |
(2 3 5) mean print</syntaxhighlight> |
||
{{out}} |
{{out}} |
||
Line 2,183: | Line 2,183: | ||
=={{header|MiniScript}}== |
=={{header|MiniScript}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="miniscript">arr = [ 1, 3, 7, 8, 9, 1 ] |
||
avg = function(arr) |
avg = function(arr) |
||
Line 2,196: | Line 2,196: | ||
=={{header|МК-61/52}}== |
=={{header|МК-61/52}}== |
||
<lang>0 П0 П1 С/П ИП0 ИП1 * + ИП1 1 |
<syntaxhighlight lang="text">0 П0 П1 С/П ИП0 ИП1 * + ИП1 1 |
||
+ П1 / П0 БП 03</syntaxhighlight> |
+ П1 / П0 БП 03</syntaxhighlight> |
||
Line 2,204: | Line 2,204: | ||
=={{header|Modula-2}}== |
=={{header|Modula-2}}== |
||
<syntaxhighlight lang=modula2>PROCEDURE Avg; |
<syntaxhighlight lang="modula2">PROCEDURE Avg; |
||
VAR avg : REAL; |
VAR avg : REAL; |
||
Line 2,215: | Line 2,215: | ||
END Avg;</syntaxhighlight> |
END Avg;</syntaxhighlight> |
||
OR |
OR |
||
<syntaxhighlight lang=modula2>PROCEDURE Average (Data : ARRAY OF REAL; Samples : CARDINAL) : REAL; |
<syntaxhighlight lang="modula2">PROCEDURE Average (Data : ARRAY OF REAL; Samples : CARDINAL) : REAL; |
||
(* Calculate the average over 'Samples' values, stored in array 'Data'. *) |
(* Calculate the average over 'Samples' values, stored in array 'Data'. *) |
||
Line 2,231: | Line 2,231: | ||
=={{header|MUMPS}}== |
=={{header|MUMPS}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="mumps">MEAN(X) |
||
;X is assumed to be a list of numbers separated by "^" |
;X is assumed to be a list of numbers separated by "^" |
||
QUIT:'$DATA(X) "No data" |
QUIT:'$DATA(X) "No data" |
||
Line 2,250: | Line 2,250: | ||
=={{header|Nanoquery}}== |
=={{header|Nanoquery}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="nanoquery">def sum(lst) |
||
sum = 0 |
sum = 0 |
||
for n in lst |
for n in lst |
||
Line 2,263: | Line 2,263: | ||
=={{header|Nemerle}}== |
=={{header|Nemerle}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="nemerle">using System; |
||
using System.Console; |
using System.Console; |
||
using Nemerle.Collections; |
using Nemerle.Collections; |
||
Line 2,282: | Line 2,282: | ||
=={{header|NetRexx}}== |
=={{header|NetRexx}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="netrexx">/* NetRexx */ |
||
options replace format comments java crossref symbols nobinary |
options replace format comments java crossref symbols nobinary |
||
Line 2,357: | Line 2,357: | ||
=={{header|NewLISP}}== |
=={{header|NewLISP}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="newlisp">(define (Mean Lst) |
||
(if (empty? Lst) |
(if (empty? Lst) |
||
0 |
0 |
||
Line 2,367: | Line 2,367: | ||
=={{header|Nial}}== |
=={{header|Nial}}== |
||
in the standard way, mean is |
in the standard way, mean is |
||
<syntaxhighlight lang=nial>mean is / [sum, tally] |
<syntaxhighlight lang="nial">mean is / [sum, tally] |
||
mean 6 2 4 |
mean 6 2 4 |
||
Line 2,373: | Line 2,373: | ||
but it fails with 0 length vectors. so using a tally with a minimum value 1 |
but it fails with 0 length vectors. so using a tally with a minimum value 1 |
||
<syntaxhighlight lang=nial>dtally is recur [ empty rest, 1 first, 1 first, plus, rest ] |
<syntaxhighlight lang="nial">dtally is recur [ empty rest, 1 first, 1 first, plus, rest ] |
||
mean is / [sum, dtally] |
mean is / [sum, dtally] |
||
Line 2,381: | Line 2,381: | ||
=={{header|Nim}}== |
=={{header|Nim}}== |
||
{{trans|C}} |
{{trans|C}} |
||
<syntaxhighlight lang=nim>import strutils |
<syntaxhighlight lang="nim">import strutils |
||
proc mean(xs: openArray[float]): float = |
proc mean(xs: openArray[float]): float = |
||
Line 2,401: | Line 2,401: | ||
=={{header|Niue}}== |
=={{header|Niue}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="niue"> |
||
[ [ , len 1 - at ! ] len 3 - times swap , ] 'map ; ( a Lisp like map, to sum the stack ) |
[ [ , len 1 - at ! ] len 3 - times swap , ] 'map ; ( a Lisp like map, to sum the stack ) |
||
[ len 'n ; [ + ] 0 n swap-at map n / ] 'avg ; |
[ len 'n ; [ + ] 0 n swap-at map n / ] 'avg ; |
||
Line 2,413: | Line 2,413: | ||
=={{header|Oberon-2}}== |
=={{header|Oberon-2}}== |
||
Oxford Oberon-2 |
Oxford Oberon-2 |
||
<syntaxhighlight lang=oberon2> |
<syntaxhighlight lang="oberon2"> |
||
MODULE AvgMean; |
MODULE AvgMean; |
||
IMPORT Out; |
IMPORT Out; |
||
Line 2,450: | Line 2,450: | ||
=={{header|Objeck}}== |
=={{header|Objeck}}== |
||
<syntaxhighlight lang=objeck> |
<syntaxhighlight lang="objeck"> |
||
function : native : PrintAverage(values : FloatVector) ~ Nil { |
function : native : PrintAverage(values : FloatVector) ~ Nil { |
||
values->Average()->PrintLine(); |
values->Average()->PrintLine(); |
||
Line 2,459: | Line 2,459: | ||
These functions return a float: |
These functions return a float: |
||
<syntaxhighlight lang=ocaml>let mean_floats = function |
<syntaxhighlight lang="ocaml">let mean_floats = function |
||
| [] -> 0. |
| [] -> 0. |
||
| xs -> List.fold_left (+.) 0. xs /. float_of_int (List.length xs) |
| xs -> List.fold_left (+.) 0. xs /. float_of_int (List.length xs) |
||
Line 2,475: | Line 2,475: | ||
would rather be handled by an exception. |
would rather be handled by an exception. |
||
<syntaxhighlight lang=ocaml>let mean_floats xs = |
<syntaxhighlight lang="ocaml">let mean_floats xs = |
||
if xs = [] then |
if xs = [] then |
||
invalid_arg "empty list" |
invalid_arg "empty list" |
||
Line 2,504: | Line 2,504: | ||
GNU Octave has a <tt>mean</tt> function (from statistics package), but it does not handle an empty vector; an implementation that allows that is: |
GNU Octave has a <tt>mean</tt> function (from statistics package), but it does not handle an empty vector; an implementation that allows that is: |
||
<syntaxhighlight lang=octave>function m = omean(l) |
<syntaxhighlight lang="octave">function m = omean(l) |
||
if ( numel(l) == 0 ) |
if ( numel(l) == 0 ) |
||
m = 0; |
m = 0; |
||
Line 2,517: | Line 2,517: | ||
If the data contains missing value, encoded as non-a-number: |
If the data contains missing value, encoded as non-a-number: |
||
<syntaxhighlight lang=octave>function m = omean(l) |
<syntaxhighlight lang="octave">function m = omean(l) |
||
n = sum(~isnan(l)); |
n = sum(~isnan(l)); |
||
l(isnan(l))=0; |
l(isnan(l))=0; |
||
Line 2,526: | Line 2,526: | ||
=={{header|Oforth}}== |
=={{header|Oforth}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="oforth">: avg ( x -- avg ) |
||
x sum |
x sum |
||
x size dup ifZero: [ 2drop null ] else: [ >float / ] |
x size dup ifZero: [ 2drop null ] else: [ >float / ] |
||
Line 2,540: | Line 2,540: | ||
=={{header|ooRexx}}== |
=={{header|ooRexx}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="oorexx"> |
||
call testAverage .array~of(10, 9, 8, 7, 6, 5, 4, 3, 2, 1) |
call testAverage .array~of(10, 9, 8, 7, 6, 5, 4, 3, 2, 1) |
||
call testAverage .array~of(10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, .11) |
call testAverage .array~of(10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, .11) |
||
Line 2,580: | Line 2,580: | ||
=={{header|Oz}}== |
=={{header|Oz}}== |
||
A version working on floats: |
A version working on floats: |
||
<syntaxhighlight lang=oz>declare |
<syntaxhighlight lang="oz">declare |
||
fun {Mean Xs} |
fun {Mean Xs} |
||
{FoldL Xs Number.'+' 0.0} / {Int.toFloat {Length Xs}} |
{FoldL Xs Number.'+' 0.0} / {Int.toFloat {Length Xs}} |
||
Line 2,588: | Line 2,588: | ||
=={{header|PARI/GP}}== |
=={{header|PARI/GP}}== |
||
<syntaxhighlight lang=parigp>avg(v)={ |
<syntaxhighlight lang="parigp">avg(v)={ |
||
if(#v,vecsum(v)/#v) |
if(#v,vecsum(v)/#v) |
||
};</syntaxhighlight> |
};</syntaxhighlight> |
||
=={{header|Pascal}}== |
=={{header|Pascal}}== |
||
<syntaxhighlight lang=pascal>Program Mean; |
<syntaxhighlight lang="pascal">Program Mean; |
||
function DoMean(vector: array of double): double; |
function DoMean(vector: array of double): double; |
||
Line 2,633: | Line 2,633: | ||
Alternative version using the Math unit: |
Alternative version using the Math unit: |
||
<syntaxhighlight lang=pascal>Program DoMean; |
<syntaxhighlight lang="pascal">Program DoMean; |
||
uses math; |
uses math; |
||
const |
const |
||
Line 2,653: | Line 2,653: | ||
=={{header|Perl}}== |
=={{header|Perl}}== |
||
<syntaxhighlight lang=perl>sub avg { |
<syntaxhighlight lang="perl">sub avg { |
||
@_ or return 0; |
@_ or return 0; |
||
my $sum = 0; |
my $sum = 0; |
||
Line 2,663: | Line 2,663: | ||
=={{header|Phix}}== |
=={{header|Phix}}== |
||
<!--<syntaxhighlight lang= |
<!--<syntaxhighlight lang="phix">(phixonline)--> |
||
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span> |
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span> |
||
<span style="color: #008080;">function</span> <span style="color: #000000;">mean</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> |
<span style="color: #008080;">function</span> <span style="color: #000000;">mean</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> |
||
Line 2,674: | Line 2,674: | ||
=={{header|Phixmonti}}== |
=={{header|Phixmonti}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="phixmonti">1 2 5 -5 -9.5 3.14159 stklen tolist |
||
len swap sum swap / print</syntaxhighlight> |
len swap sum swap / print</syntaxhighlight> |
||
=={{header|PHP}}== |
=={{header|PHP}}== |
||
<syntaxhighlight lang=php>$nums = array(3, 1, 4, 1, 5, 9); |
<syntaxhighlight lang="php">$nums = array(3, 1, 4, 1, 5, 9); |
||
if ($nums) |
if ($nums) |
||
echo array_sum($nums) / count($nums), "\n"; |
echo array_sum($nums) / count($nums), "\n"; |
||
Line 2,685: | Line 2,685: | ||
=={{header|PicoLisp}}== |
=={{header|PicoLisp}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="picolisp">(de mean (Lst) |
||
(if (atom Lst) |
(if (atom Lst) |
||
0 |
0 |
||
Line 2,694: | Line 2,694: | ||
=={{header|PL/I}}== |
=={{header|PL/I}}== |
||
<syntaxhighlight lang=pli>arithmetic_mean = sum(A)/dimension(A,1);</syntaxhighlight> |
<syntaxhighlight lang="pli">arithmetic_mean = sum(A)/dimension(A,1);</syntaxhighlight> |
||
=={{header|Plain English}}== |
=={{header|Plain English}}== |
||
<syntaxhighlight lang=plainenglish>To run: |
<syntaxhighlight lang="plainenglish">To run: |
||
Start up. |
Start up. |
||
Demonstrate finding the arithmetic mean. |
Demonstrate finding the arithmetic mean. |
||
Line 2,755: | Line 2,755: | ||
=={{header|Pop11}}== |
=={{header|Pop11}}== |
||
<syntaxhighlight lang=pop11>define mean(v); |
<syntaxhighlight lang="pop11">define mean(v); |
||
lvars n = length(v), i, s = 0; |
lvars n = length(v), i, s = 0; |
||
if n = 0 then |
if n = 0 then |
||
Line 2,768: | Line 2,768: | ||
=={{header|PostScript}}== |
=={{header|PostScript}}== |
||
<lang> |
<syntaxhighlight lang="text"> |
||
/findmean{ |
/findmean{ |
||
/x exch def |
/x exch def |
||
Line 2,788: | Line 2,788: | ||
{{libheader|initlib}} |
{{libheader|initlib}} |
||
{{works with|Ghostscript}} |
{{works with|Ghostscript}} |
||
<syntaxhighlight lang=postscript> |
<syntaxhighlight lang="postscript"> |
||
/avg { |
/avg { |
||
dup length |
dup length |
||
Line 2,801: | Line 2,801: | ||
=={{header|PowerShell}}== |
=={{header|PowerShell}}== |
||
The hard way by calculating a sum and dividing: |
The hard way by calculating a sum and dividing: |
||
<syntaxhighlight lang=powershell>function mean ($x) { |
<syntaxhighlight lang="powershell">function mean ($x) { |
||
if ($x.Count -eq 0) { |
if ($x.Count -eq 0) { |
||
return 0 |
return 0 |
||
Line 2,813: | Line 2,813: | ||
}</syntaxhighlight> |
}</syntaxhighlight> |
||
or, shorter, by using the <code>Measure-Object</code> cmdlet which already knows how to compute an average: |
or, shorter, by using the <code>Measure-Object</code> cmdlet which already knows how to compute an average: |
||
<syntaxhighlight lang=powershell>function mean ($x) { |
<syntaxhighlight lang="powershell">function mean ($x) { |
||
if ($x.Count -eq 0) { |
if ($x.Count -eq 0) { |
||
return 0 |
return 0 |
||
Line 2,822: | Line 2,822: | ||
=={{header|Processing}}== |
=={{header|Processing}}== |
||
<syntaxhighlight lang=processing>float mean(float[] arr) { |
<syntaxhighlight lang="processing">float mean(float[] arr) { |
||
float out = 0; |
float out = 0; |
||
for (float n : arr) { |
for (float n : arr) { |
||
Line 2,834: | Line 2,834: | ||
{{works with|SWI-Prolog|6.6}} |
{{works with|SWI-Prolog|6.6}} |
||
<syntaxhighlight lang=prolog> |
<syntaxhighlight lang="prolog"> |
||
mean(List, Mean) :- |
mean(List, Mean) :- |
||
length(List, Length), |
length(List, Length), |
||
Line 2,842: | Line 2,842: | ||
=={{header|PureBasic}}== |
=={{header|PureBasic}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="purebasic">Procedure.d mean(List number()) |
||
Protected sum=0 |
Protected sum=0 |
||
Line 2,855: | Line 2,855: | ||
{{works with|Python|3.0}}.<br>{{works with|Python|2.6}}<br> |
{{works with|Python|3.0}}.<br>{{works with|Python|2.6}}<br> |
||
Uses [http://docs.python.org/3.3/library/math.html?highlight=fsum#math.fsum fsum] which tracks multiple partial sums to avoid losing precision |
Uses [http://docs.python.org/3.3/library/math.html?highlight=fsum#math.fsum fsum] which tracks multiple partial sums to avoid losing precision |
||
<syntaxhighlight lang=python>from math import fsum |
<syntaxhighlight lang="python">from math import fsum |
||
def average(x): |
def average(x): |
||
return fsum(x)/float(len(x)) if x else 0 |
return fsum(x)/float(len(x)) if x else 0 |
||
Line 2,862: | Line 2,862: | ||
{{out}} |
{{out}} |
||
<syntaxhighlight lang=python>2.3 |
<syntaxhighlight lang="python">2.3 |
||
2.3</syntaxhighlight> |
2.3</syntaxhighlight> |
||
{{works with|Python|2.5}} |
{{works with|Python|2.5}} |
||
<syntaxhighlight lang=python>def average(x): |
<syntaxhighlight lang="python">def average(x): |
||
return sum(x)/float(len(x)) if x else 0 |
return sum(x)/float(len(x)) if x else 0 |
||
print (average([0,0,3,1,4,1,5,9,0,0])) |
print (average([0,0,3,1,4,1,5,9,0,0])) |
||
Line 2,874: | Line 2,874: | ||
{{out}} |
{{out}} |
||
(Notice how the second call gave the wrong result) |
(Notice how the second call gave the wrong result) |
||
<syntaxhighlight lang=python>2.3 |
<syntaxhighlight lang="python">2.3 |
||
1e-21</syntaxhighlight> |
1e-21</syntaxhighlight> |
||
{{works with|Python|2.4}} |
{{works with|Python|2.4}} |
||
<syntaxhighlight lang=python>def avg(data): |
<syntaxhighlight lang="python">def avg(data): |
||
if len(data)==0: |
if len(data)==0: |
||
return 0 |
return 0 |
||
Line 2,887: | Line 2,887: | ||
{{out}} |
{{out}} |
||
<syntaxhighlight lang=python>2.3</syntaxhighlight> |
<syntaxhighlight lang="python">2.3</syntaxhighlight> |
||
{{works with|Python|3.4}} |
{{works with|Python|3.4}} |
||
Since 3.4, Python has a [[http://docs.python.org/3/library/statistics.html statistics] library in the stdlib, which takes care of these precision overflow issues in a way that works for all standard types, not just float, even with values way too big or small to fit in a float. (For Python 2.6-2.7, there's a backport available on PyPI.) |
Since 3.4, Python has a [[http://docs.python.org/3/library/statistics.html statistics] library in the stdlib, which takes care of these precision overflow issues in a way that works for all standard types, not just float, even with values way too big or small to fit in a float. (For Python 2.6-2.7, there's a backport available on PyPI.) |
||
<syntaxhighlight lang=python>>>> from statistics import mean |
<syntaxhighlight lang="python">>>> from statistics import mean |
||
>>> mean([1e20,-1e-20,3,1,4,1,5,9,-1e20,1e-20]) |
>>> mean([1e20,-1e-20,3,1,4,1,5,9,-1e20,1e-20]) |
||
2.3 |
2.3 |
||
Line 2,904: | Line 2,904: | ||
=={{header|Q}}== |
=={{header|Q}}== |
||
A built-in solution is <tt>avg</tt>. An implementation of it could be: |
A built-in solution is <tt>avg</tt>. An implementation of it could be: |
||
<syntaxhighlight lang=q>mean:{(sum x)%count x}</syntaxhighlight> |
<syntaxhighlight lang="q">mean:{(sum x)%count x}</syntaxhighlight> |
||
=={{header|Quackery}}== |
=={{header|Quackery}}== |
||
Line 2,910: | Line 2,910: | ||
Using the Quackery big number rational arithmetic library <code>bigrat.qky</code>. |
Using the Quackery big number rational arithmetic library <code>bigrat.qky</code>. |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="quackery"> [ $ 'bigrat.qky' loadfile ] now! |
||
[ [] swap times |
[ [] swap times |
||
Line 2,990: | Line 2,990: | ||
R has its <tt>mean</tt> function but it does not allow for NULL (void vectors or whatever) as argument: in this case it raises a warning and the result is NA. An implementation that does not suppress the warning could be: |
R has its <tt>mean</tt> function but it does not allow for NULL (void vectors or whatever) as argument: in this case it raises a warning and the result is NA. An implementation that does not suppress the warning could be: |
||
<syntaxhighlight lang=rsplus>omean <- function(v) { |
<syntaxhighlight lang="rsplus">omean <- function(v) { |
||
m <- mean(v) |
m <- mean(v) |
||
ifelse(is.na(m), 0, m) |
ifelse(is.na(m), 0, m) |
||
Line 2,999: | Line 2,999: | ||
Racket's math library (available in v5.3.2 and newer) comes with a <tt>mean</tt> function that works on arbitrary sequences. |
Racket's math library (available in v5.3.2 and newer) comes with a <tt>mean</tt> function that works on arbitrary sequences. |
||
<syntaxhighlight lang=racket> |
<syntaxhighlight lang="racket"> |
||
#lang racket |
#lang racket |
||
(require math) |
(require math) |
||
Line 3,012: | Line 3,012: | ||
{{works with|Rakudo|2015.10-11}} |
{{works with|Rakudo|2015.10-11}} |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="raku" line>multi mean([]){ Failure.new('mean on empty list is not defined') }; # Failure-objects are lazy exceptions |
||
multi mean (@a) { ([+] @a) / @a }</syntaxhighlight> |
multi mean (@a) { ([+] @a) / @a }</syntaxhighlight> |
||
=={{header|Rapira}}== |
=={{header|Rapira}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="rapira">fun mean(arr) |
||
sum := 0 |
sum := 0 |
||
for N from 1 to #arr do |
for N from 1 to #arr do |
||
Line 3,025: | Line 3,025: | ||
=={{header|REBOL}}== |
=={{header|REBOL}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="rebol">rebol [ |
||
Title: "Arithmetic Mean (Average)" |
Title: "Arithmetic Mean (Average)" |
||
URL: http://rosettacode.org/wiki/Average/Arithmetic_mean |
URL: http://rosettacode.org/wiki/Average/Arithmetic_mean |
||
Line 3,054: | Line 3,054: | ||
=={{header|Red}}== |
=={{header|Red}}== |
||
Red comes with the <code>average</code> function. |
Red comes with the <code>average</code> function. |
||
<syntaxhighlight lang=red>Red ["Arithmetic mean"] |
<syntaxhighlight lang="red">Red ["Arithmetic mean"] |
||
print average [] |
print average [] |
||
Line 3,065: | Line 3,065: | ||
The source code for <code>average</code>: |
The source code for <code>average</code>: |
||
<syntaxhighlight lang=red>average: func [ |
<syntaxhighlight lang="red">average: func [ |
||
"Returns the average of all values in a block" |
"Returns the average of all values in a block" |
||
block [block! vector! paren! hash!] |
block [block! vector! paren! hash!] |
||
Line 3,075: | Line 3,075: | ||
=={{header|ReScript}}== |
=={{header|ReScript}}== |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="rescript">let arr = [3, 8, 4, 1, 5, 12] |
||
let num = Js.Array.length(arr) |
let num = Js.Array.length(arr) |
||
Line 3,093: | Line 3,093: | ||
A check is made to validate if the numbers in the list are all numeric. |
A check is made to validate if the numbers in the list are all numeric. |
||
<syntaxhighlight lang=rexx>/*REXX program finds the averages/arithmetic mean of several lists (vectors) or CL input*/ |
<syntaxhighlight lang="rexx">/*REXX program finds the averages/arithmetic mean of several lists (vectors) or CL input*/ |
||
parse arg @.1; if @.1='' then do; #=6 /*vector from the C.L.?*/ |
parse arg @.1; if @.1='' then do; #=6 /*vector from the C.L.?*/ |
||
@.1 = 10 9 8 7 6 5 4 3 2 1 |
@.1 = 10 9 8 7 6 5 4 3 2 1 |
||
Line 3,154: | Line 3,154: | ||
=={{header|Ring}}== |
=={{header|Ring}}== |
||
<syntaxhighlight lang=ring> |
<syntaxhighlight lang="ring"> |
||
nums = [1,2,3,4,5,6,7,8,9,10] |
nums = [1,2,3,4,5,6,7,8,9,10] |
||
sum = 0 |
sum = 0 |
||
Line 3,170: | Line 3,170: | ||
This is a simple rewrite of the dc version above. This works on an HP 48. "->" is a single right arrow character on the 48. Feel free to alter this code as necessary to work on RPL/2. |
This is a simple rewrite of the dc version above. This works on an HP 48. "->" is a single right arrow character on the 48. Feel free to alter this code as necessary to work on RPL/2. |
||
<syntaxhighlight lang=rpl/2>1 2 3 5 7 |
<syntaxhighlight lang="rpl/2">1 2 3 5 7 |
||
AMEAN |
AMEAN |
||
<< DEPTH DUP 'N' STO ->LIST ΣLIST N / >> |
<< DEPTH DUP 'N' STO ->LIST ΣLIST N / >> |
||
Line 3,176: | Line 3,176: | ||
=={{header|Ruby}}== |
=={{header|Ruby}}== |
||
<syntaxhighlight lang=ruby>def mean(nums) |
<syntaxhighlight lang="ruby">def mean(nums) |
||
nums.sum(0.0) / nums.size |
nums.sum(0.0) / nums.size |
||
end |
end |
||
Line 3,197: | Line 3,197: | ||
=={{header|Run BASIC}}== |
=={{header|Run BASIC}}== |
||
<syntaxhighlight lang=runbasic>print "Gimme the number in the array:";input numArray |
<syntaxhighlight lang="runbasic">print "Gimme the number in the array:";input numArray |
||
dim value(numArray) |
dim value(numArray) |
||
for i = 1 to numArray |
for i = 1 to numArray |
||
Line 3,210: | Line 3,210: | ||
=={{header|Rust}}== |
=={{header|Rust}}== |
||
<syntaxhighlight lang=rust>fn sum(arr: &[f64]) -> f64 { |
<syntaxhighlight lang="rust">fn sum(arr: &[f64]) -> f64 { |
||
arr.iter().fold(0.0, |p,&q| p + q) |
arr.iter().fold(0.0, |p,&q| p + q) |
||
} |
} |
||
Line 3,231: | Line 3,231: | ||
=={{header|Sather}}== |
=={{header|Sather}}== |
||
Built to work with VEC, ("geometric" vectors), whose elements must be floats. A 0-dimension vector yields "nan". |
Built to work with VEC, ("geometric" vectors), whose elements must be floats. A 0-dimension vector yields "nan". |
||
<syntaxhighlight lang=sather>class VECOPS is |
<syntaxhighlight lang="sather">class VECOPS is |
||
mean(v:VEC):FLT is |
mean(v:VEC):FLT is |
||
m ::= 0.0; |
m ::= 0.0; |
||
Line 3,249: | Line 3,249: | ||
Using Scala 2.7, this has to be defined for each numeric type: |
Using Scala 2.7, this has to be defined for each numeric type: |
||
<syntaxhighlight lang=scala>def mean(s: Seq[Int]) = s.foldLeft(0)(_+_) / s.size</syntaxhighlight> |
<syntaxhighlight lang="scala">def mean(s: Seq[Int]) = s.foldLeft(0)(_+_) / s.size</syntaxhighlight> |
||
However, Scala 2.8 gives much more flexibility, but you still have to opt |
However, Scala 2.8 gives much more flexibility, but you still have to opt |
||
between integral types and fractional types. For example: |
between integral types and fractional types. For example: |
||
<syntaxhighlight lang=scala>def mean[T](s: Seq[T])(implicit n: Integral[T]) = { |
<syntaxhighlight lang="scala">def mean[T](s: Seq[T])(implicit n: Integral[T]) = { |
||
import n._ |
import n._ |
||
s.foldLeft(zero)(_+_) / fromInt(s.size) |
s.foldLeft(zero)(_+_) / fromInt(s.size) |
||
Line 3,267: | Line 3,267: | ||
Alas, Scala 2.8 also simplifies the task in another way: |
Alas, Scala 2.8 also simplifies the task in another way: |
||
<syntaxhighlight lang=scala>def mean[T](s: Seq[T])(implicit n: Fractional[T]) = n.div(s.sum, n.fromInt(s.size))</syntaxhighlight> |
<syntaxhighlight lang="scala">def mean[T](s: Seq[T])(implicit n: Fractional[T]) = n.div(s.sum, n.fromInt(s.size))</syntaxhighlight> |
||
Here we show a function that supports fractional types. Instead of importing the definitions |
Here we show a function that supports fractional types. Instead of importing the definitions |
||
Line 3,275: | Line 3,275: | ||
=={{header|Scheme}}== |
=={{header|Scheme}}== |
||
<syntaxhighlight lang=scheme>(define (mean l) |
<syntaxhighlight lang="scheme">(define (mean l) |
||
(if (null? l) |
(if (null? l) |
||
0 |
0 |
||
Line 3,284: | Line 3,284: | ||
=={{header|Seed7}}== |
=={{header|Seed7}}== |
||
<syntaxhighlight lang=seed7>$ include "seed7_05.s7i"; |
<syntaxhighlight lang="seed7">$ include "seed7_05.s7i"; |
||
include "float.s7i"; |
include "float.s7i"; |
||
Line 3,311: | Line 3,311: | ||
=={{header|SenseTalk}}== |
=={{header|SenseTalk}}== |
||
SenseTalk has a built-in average function. |
SenseTalk has a built-in average function. |
||
<syntaxhighlight lang=sensetalk>put the average of [12,92,-17,66,128] |
<syntaxhighlight lang="sensetalk">put the average of [12,92,-17,66,128] |
||
put average(empty) |
put average(empty) |
||
Line 3,322: | Line 3,322: | ||
=={{header|Sidef}}== |
=={{header|Sidef}}== |
||
<syntaxhighlight lang=ruby>func avg(Array list) { |
<syntaxhighlight lang="ruby">func avg(Array list) { |
||
list.len > 0 || return 0; |
list.len > 0 || return 0; |
||
list.sum / list.len; |
list.sum / list.len; |
||
Line 3,341: | Line 3,341: | ||
=={{header|Slate}}== |
=={{header|Slate}}== |
||
<syntaxhighlight lang=slate>[|:list| (list reduce: #+ `er ifEmpty: [0]) / (list isEmpty ifTrue: [1] ifFalse: [list size])] applyWith: #(3 1 4 1 5 9). |
<syntaxhighlight lang="slate">[|:list| (list reduce: #+ `er ifEmpty: [0]) / (list isEmpty ifTrue: [1] ifFalse: [list size])] applyWith: #(3 1 4 1 5 9). |
||
[|:list| (list reduce: #+ `er ifEmpty: [0]) / (list isEmpty ifTrue: [1] ifFalse: [list size])] applyWith: {}.</syntaxhighlight> |
[|:list| (list reduce: #+ `er ifEmpty: [0]) / (list isEmpty ifTrue: [1] ifFalse: [list size])] applyWith: {}.</syntaxhighlight> |
||
=={{header|Smalltalk}}== |
=={{header|Smalltalk}}== |
||
<syntaxhighlight lang=smalltalk> |
<syntaxhighlight lang="smalltalk"> |
||
| numbers | |
| numbers | |
||
Line 3,356: | Line 3,356: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
However, the empty check can be omitted, as inject returns the injected value for empty collections, and we probably do not care for the average of nothing (i.e. the division by zero exception): |
However, the empty check can be omitted, as inject returns the injected value for empty collections, and we probably do not care for the average of nothing (i.e. the division by zero exception): |
||
<syntaxhighlight lang=smalltalk> |
<syntaxhighlight lang="smalltalk"> |
||
| numbers | |
| numbers | |
||
Line 3,365: | Line 3,365: | ||
{{works with|Pharo}} |
{{works with|Pharo}} |
||
{{works with|Smalltalk/X}} |
{{works with|Smalltalk/X}} |
||
<syntaxhighlight lang=smalltalk> |
<syntaxhighlight lang="smalltalk"> |
||
| numbers | |
| numbers | |
||
Line 3,372: | Line 3,372: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
or |
or |
||
<syntaxhighlight lang=smalltalk> |
<syntaxhighlight lang="smalltalk"> |
||
| numbers | |
| numbers | |
||
Line 3,385: | Line 3,385: | ||
{{works with|CSnobol}} |
{{works with|CSnobol}} |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="snobol4"> define('avg(a)i,sum') :(avg_end) |
||
avg i = i + 1; sum = sum + a<i> :s(avg) |
avg i = i + 1; sum = sum + a<i> :s(avg) |
||
avg = 1.0 * sum / prototype(a) :(return) |
avg = 1.0 * sum / prototype(a) :(return) |
||
Line 3,406: | Line 3,406: | ||
=={{header|SQL}}== |
=={{header|SQL}}== |
||
Tested on Oracle 11gR2, the more limited the tool, the more resourceful one becomes :) |
Tested on Oracle 11gR2, the more limited the tool, the more resourceful one becomes :) |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="sql"> |
||
create table "numbers" ("datapoint" integer); |
create table "numbers" ("datapoint" integer); |
||
Line 3,414: | Line 3,414: | ||
</syntaxhighlight> |
</syntaxhighlight> |
||
...or... |
...or... |
||
<syntaxhighlight lang= |
<syntaxhighlight lang="sql">select avg("datapoint") from "numbers";</syntaxhighlight> |
||
=={{header|Standard ML}}== |
=={{header|Standard ML}}== |
||
These functions return a real: |
These functions return a real: |
||
<syntaxhighlight lang=sml>fun mean_reals [] = 0.0 |
<syntaxhighlight lang="sml">fun mean_reals [] = 0.0 |
||
| mean_reals xs = foldl op+ 0.0 xs / real (length xs); |
| mean_reals xs = foldl op+ 0.0 xs / real (length xs); |
||
Line 3,432: | Line 3,432: | ||
would rather be handled by an exception. |
would rather be handled by an exception. |
||
<syntaxhighlight lang=sml>fun mean_reals [] = raise Empty |
<syntaxhighlight lang="sml">fun mean_reals [] = raise Empty |
||
| mean_reals xs = let |
| mean_reals xs = let |
||
val (total, length) = |
val (total, length) = |
||
Line 3,456: | Line 3,456: | ||
=== Mean of a dataset variable === |
=== Mean of a dataset variable === |
||
Illustration of the mean on the population (in millions) in january 2016 of a few european countries (source [http://appsso.eurostat.ec.europa.eu/nui/show.do?dataset=demo_gind&lang=fr Eurostat]). |
Illustration of the mean on the population (in millions) in january 2016 of a few european countries (source [http://appsso.eurostat.ec.europa.eu/nui/show.do?dataset=demo_gind&lang=fr Eurostat]). |
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<lang>clear all |
<syntaxhighlight lang="text">clear all |
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input str20 country population |
input str20 country population |
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Belgium 11311.1 |
Belgium 11311.1 |
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=== Mean in Mata === |
=== Mean in Mata === |
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<syntaxhighlight lang=stata>mata |
<syntaxhighlight lang="stata">mata |
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a=11311.1\7153.8\10553.8\5707.3\ |
a=11311.1\7153.8\10553.8\5707.3\ |
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82175.7\1315.9\4724.7\10783.7 |
82175.7\1315.9\4724.7\10783.7 |
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=={{header|Swift}}== |
=={{header|Swift}}== |
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<syntaxhighlight lang=swift>func meanDoubles(s: [Double]) -> Double { |
<syntaxhighlight lang="swift">func meanDoubles(s: [Double]) -> Double { |
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return s.reduce(0, +) / Double(s.count) |
return s.reduce(0, +) / Double(s.count) |
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} |
} |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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<syntaxhighlight lang=tcl>package require Tcl 8.5 |
<syntaxhighlight lang="tcl">package require Tcl 8.5 |
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proc mean args { |
proc mean args { |
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if {[set num [llength $args]] == 0} {return 0} |
if {[set num [llength $args]] == 0} {return 0} |
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=={{header|TI-83 BASIC}}== |
=={{header|TI-83 BASIC}}== |
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<syntaxhighlight lang=ti83b>Mean(Ans</syntaxhighlight> |
<syntaxhighlight lang="ti83b">Mean(Ans</syntaxhighlight> |
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=={{header|TI-89 BASIC}}== |
=={{header|TI-89 BASIC}}== |
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<syntaxhighlight lang=ti89b>Define rcmean(nums) = when(dim(nums) = 0, 0, mean(nums))</syntaxhighlight> |
<syntaxhighlight lang="ti89b">Define rcmean(nums) = when(dim(nums) = 0, 0, mean(nums))</syntaxhighlight> |
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=={{header|Trith}}== |
=={{header|Trith}}== |
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<syntaxhighlight lang=trith>: mean dup empty? [drop 0] [dup [+] foldl1 swap length /] branch ; |
<syntaxhighlight lang="trith">: mean dup empty? [drop 0] [dup [+] foldl1 swap length /] branch ; |
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[3 1 4 1 5 9] mean</syntaxhighlight> |
[3 1 4 1 5 9] mean</syntaxhighlight> |
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=={{header|TypeScript}}== |
=={{header|TypeScript}}== |
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<syntaxhighlight lang=typescript> |
<syntaxhighlight lang="typescript"> |
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function mean(numbersArr) |
function mean(numbersArr) |
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{ |
{ |
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=={{header|UNIX Shell}}== |
=={{header|UNIX Shell}}== |
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1) First solution with bash (V >= 3), works with floats : |
1) First solution with bash (V >= 3), works with floats : |
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<syntaxhighlight lang=bash1>echo "`cat f | paste -sd+ | bc -l` / `cat f | wc -l`" | bc -l |
<syntaxhighlight lang="bash1">echo "`cat f | paste -sd+ | bc -l` / `cat f | wc -l`" | bc -l |
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</syntaxhighlight> |
</syntaxhighlight> |
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<syntaxhighlight lang=bash1>cat f |
<syntaxhighlight lang="bash1">cat f |
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1 |
1 |
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2 |
2 |
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2) This example uses <tt>expr</tt>, so it only works with integers. It checks that each string in the list is an integer. |
2) This example uses <tt>expr</tt>, so it only works with integers. It checks that each string in the list is an integer. |
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<syntaxhighlight lang=bash>mean() { |
<syntaxhighlight lang="bash">mean() { |
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if expr $# >/dev/null; then |
if expr $# >/dev/null; then |
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(count=0 |
(count=0 |
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Uses [[ksh93]]-style process substitution. Also overwrites the file named <tt>count</tt> in the current directory. |
Uses [[ksh93]]-style process substitution. Also overwrites the file named <tt>count</tt> in the current directory. |
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{{works with|bash}} |
{{works with|bash}} |
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<syntaxhighlight lang=bash>term() { |
<syntaxhighlight lang="bash">term() { |
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b=$1;res=$2 |
b=$1;res=$2 |
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echo "scale=5;$res+$b" | bc |
echo "scale=5;$res+$b" | bc |
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=={{header|Ursa}}== |
=={{header|Ursa}}== |
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<syntaxhighlight lang=ursa># |
<syntaxhighlight lang="ursa"># |
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# arithmetic mean |
# arithmetic mean |
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# |
# |
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There is a library function for means already, although it doesn't cope with |
There is a library function for means already, although it doesn't cope with |
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empty vectors. A mean function could be defined as shown for this task. |
empty vectors. A mean function could be defined as shown for this task. |
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<syntaxhighlight lang= |
<syntaxhighlight lang="ursala">#import nat |
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#import flo |
#import flo |
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=={{header|V}}== |
=={{header|V}}== |
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<syntaxhighlight lang=v>[mean |
<syntaxhighlight lang="v">[mean |
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[sum 0 [+] fold]. |
[sum 0 [+] fold]. |
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dup sum |
dup sum |
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=={{header|Vala}}== |
=={{header|Vala}}== |
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Using array to hold the numbers of the list: |
Using array to hold the numbers of the list: |
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<syntaxhighlight lang=vala> |
<syntaxhighlight lang="vala"> |
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double arithmetic(double[] list){ |
double arithmetic(double[] list){ |
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double mean; |
double mean; |
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=={{header|VBA}}== |
=={{header|VBA}}== |
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<syntaxhighlight lang=vb>Private Function mean(v() As Double, ByVal leng As Integer) As Variant |
<syntaxhighlight lang="vb">Private Function mean(v() As Double, ByVal leng As Integer) As Variant |
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Dim sum As Double, i As Integer |
Dim sum As Double, i As Integer |
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sum = 0: i = 0 |
sum = 0: i = 0 |
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=={{header|VBScript}}== |
=={{header|VBScript}}== |
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<syntaxhighlight lang=vb> |
<syntaxhighlight lang="vb"> |
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Function mean(arr) |
Function mean(arr) |
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size = UBound(arr) + 1 |
size = UBound(arr) + 1 |
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=={{header|Vedit macro language}}== |
=={{header|Vedit macro language}}== |
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The numeric data is stored in current edit buffer as ASCII strings, one value per line. |
The numeric data is stored in current edit buffer as ASCII strings, one value per line. |
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<syntaxhighlight lang=vedit>#1 = 0 // Sum |
<syntaxhighlight lang="vedit">#1 = 0 // Sum |
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#2 = 0 // Count |
#2 = 0 // Count |
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BOF |
BOF |
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=={{header|Vim Script}}== |
=={{header|Vim Script}}== |
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Throws an exception if the list is empty. |
Throws an exception if the list is empty. |
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<syntaxhighlight lang=vim>function Mean(lst) |
<syntaxhighlight lang="vim">function Mean(lst) |
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if empty(a:lst) |
if empty(a:lst) |
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throw "Empty" |
throw "Empty" |
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=={{header|Vlang}}== |
=={{header|Vlang}}== |
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<syntaxhighlight lang=vlang>import math |
<syntaxhighlight lang="vlang">import math |
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import arrays |
import arrays |
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=={{header|Wart}}== |
=={{header|Wart}}== |
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<syntaxhighlight lang=python>def (mean l) |
<syntaxhighlight lang="python">def (mean l) |
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sum.l / len.l</syntaxhighlight> |
sum.l / len.l</syntaxhighlight> |
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=={{header|WDTE}}== |
=={{header|WDTE}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="wdte">let s => import 'stream'; |
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let a => import 'arrays'; |
let a => import 'arrays'; |
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Usage: |
Usage: |
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<syntaxhighlight lang= |
<syntaxhighlight lang="wdte">mean [1; 2; 3] -- io.writeln io.stdout;</syntaxhighlight> |
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Output: |
Output: |
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=={{header|Wortel}}== |
=={{header|Wortel}}== |
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<syntaxhighlight lang=wortel>@let { |
<syntaxhighlight lang="wortel">@let { |
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; using a fork (sum divided-by length) |
; using a fork (sum divided-by length) |
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mean1 @(@sum / #) |
mean1 @(@sum / #) |
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=={{header|Wren}}== |
=={{header|Wren}}== |
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<syntaxhighlight lang=ecmascript>class Arithmetic { |
<syntaxhighlight lang="ecmascript">class Arithmetic { |
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static mean(arr) { |
static mean(arr) { |
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if (arr.count == 0) Fiber.abort("Length must be greater than zero") |
if (arr.count == 0) Fiber.abort("Length must be greater than zero") |
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=={{header|XLISP}}== |
=={{header|XLISP}}== |
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The specification calls for a function that takes a vector; for convenience, we convert this vector internally to a list. The mean of a zero-length vector is returned as <tt>nil</tt>, equivalent to the empty list or logical <tt>false</tt>. |
The specification calls for a function that takes a vector; for convenience, we convert this vector internally to a list. The mean of a zero-length vector is returned as <tt>nil</tt>, equivalent to the empty list or logical <tt>false</tt>. |
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<syntaxhighlight lang=lisp>(defun mean (v) |
<syntaxhighlight lang="lisp">(defun mean (v) |
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(if (= (vector-length v) 0) |
(if (= (vector-length v) 0) |
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nil |
nil |
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=={{header|XPL0}}== |
=={{header|XPL0}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="xpl0">code CrLf=9; |
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code real RlOut=48; |
code real RlOut=48; |
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Where <code>$values</code> is some variable indicating a set of nodes containing numbers, the average is given by the XPath expression: |
Where <code>$values</code> is some variable indicating a set of nodes containing numbers, the average is given by the XPath expression: |
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<syntaxhighlight lang=xpath>sum($values) div count($values)</syntaxhighlight> |
<syntaxhighlight lang="xpath">sum($values) div count($values)</syntaxhighlight> |
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===Runnable example=== |
===Runnable example=== |
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<syntaxhighlight lang=xml><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> |
<syntaxhighlight lang="xml"><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> |
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<xsl:output method="text"/> |
<xsl:output method="text"/> |
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Sample input: |
Sample input: |
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<syntaxhighlight lang=xml><numbers> |
<syntaxhighlight lang="xml"><numbers> |
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<!-- Average is 2.4 --> |
<!-- Average is 2.4 --> |
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<number>1</number> |
<number>1</number> |
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=={{header|Yorick}}== |
=={{header|Yorick}}== |
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<syntaxhighlight lang=yorick>func mean(x) { |
<syntaxhighlight lang="yorick">func mean(x) { |
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if(is_void(x)) return 0; |
if(is_void(x)) return 0; |
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return x(*)(avg); |
return x(*)(avg); |
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=={{header|zkl}}== |
=={{header|zkl}}== |
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Converts int to floats (implicitly): |
Converts int to floats (implicitly): |
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<syntaxhighlight lang=zkl>fcn mean(a,b,c,etc){ z:=vm.arglist; z.reduce('+,0.0)/z.len() } |
<syntaxhighlight lang="zkl">fcn mean(a,b,c,etc){ z:=vm.arglist; z.reduce('+,0.0)/z.len() } |
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mean(3,1,4,1,5,9); //-->3.83333 |
mean(3,1,4,1,5,9); //-->3.83333 |
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mean(); //-->Exception thrown: MathError(NaN (Not a number))</syntaxhighlight> |
mean(); //-->Exception thrown: MathError(NaN (Not a number))</syntaxhighlight> |
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To pass in a vector/list: |
To pass in a vector/list: |
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<syntaxhighlight lang=zkl>fcn meanV(z){ z.reduce('+,0.0)/z.len() } |
<syntaxhighlight lang="zkl">fcn meanV(z){ z.reduce('+,0.0)/z.len() } |
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meanV(T(3,1,4,1,5,9)); // --> 3.83333</syntaxhighlight> |
meanV(T(3,1,4,1,5,9)); // --> 3.83333</syntaxhighlight> |
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=={{header|Zoea}}== |
=={{header|Zoea}}== |
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<syntaxhighlight lang= |
<syntaxhighlight lang="zoea"> |
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program: average |
program: average |
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case: 1 |
case: 1 |
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=={{header|zonnon}}== |
=={{header|zonnon}}== |
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<syntaxhighlight lang=zonnon> |
<syntaxhighlight lang="zonnon"> |
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module Averages; |
module Averages; |
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type |
type |