Write float arrays to a text file
Write two equal-sized numerical arrays 'x' and 'y' to a two-column text file named 'filename'.
You are encouraged to solve this task according to the task description, using any language you may know.
- Task
The first column of the file contains values from an 'x'-array with a given 'xprecision', the second -- values from 'y'-array with 'yprecision'.
For example, considering:
x = {1, 2, 3, 1e11};
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791};
/* sqrt(x) */
xprecision = 3;
yprecision = 5;
The file should look like:
1 1 2 1.4142 3 1.7321 1e+011 3.1623e+005
This task is intended as a subtask for Measure relative performance of sorting algorithms implementations.
Ada
<lang ada>with Ada.Text_IO; use Ada.Text_IO; with Ada.Float_Text_IO; use Ada.Float_Text_IO; with Ada.Numerics.Elementary_Functions; use Ada.Numerics.Elementary_Functions;
procedure Write_Float_Array is
type Float_Array is array (1..4) of Float;
procedure Write_Columns
( File : File_Type;
X : Float_Array;
Y : Float_Array;
X_Pres : Natural := 3;
Y_Pres : Natural := 5
) is
begin
for I in Float_Array'range loop
Put (File => File, Item => X(I), Fore => 1, Aft => X_Pres - 1);
Put (File, " ");
Put (File => File, Item => Y(I), Fore => 1, Aft => Y_Pres - 1);
New_Line (File);
end loop;
end Write_Columns;
File : File_Type;
X : Float_Array := (1.0, 2.0, 3.0, 1.0e11);
Y : Float_Array;
begin
Put ("Tell us the file name to write:");
Create (File, Out_File, Get_Line);
for I in Float_Array'range loop
Y(I) := Sqrt (X (I));
end loop;
Write_columns (File, X, Y);
Close (File);
end Write_Float_Array;</lang>
ALGOL 68
<lang algol68>PROC writedat = (STRING filename, []REAL x, y, INT x width, y width)VOID: (
FILE f;
INT errno = open(f, filename, stand out channel);
IF errno NE 0 THEN stop FI;
FOR i TO UPB x DO
# FORMAT := IF the absolute exponent is small enough, THEN use fixed ELSE use float FI; #
FORMAT repr x := ( ABS log(x[i])<x width | $g(-x width,x width-2)$ | $g(-x width,x width-4,-1)$ ),
repr y := ( ABS log(y[i])<y width | $g(-y width,y width-2)$ | $g(-y width,y width-4,-1)$ );
putf(f, (repr x, x[i], $" "$, repr y, y[i], $l$))
OD;
close(f)
);
- Example usage: #
test:(
[]REAL x = (1, 2, 3, 1e11);
[UPB x]REAL y; FOR i TO UPB x DO y[i]:=sqrt(x[i]) OD;
printf(($"x before:"$, $xg$, x, $l$));
printf(($"y before:"$, $xg$, y, $l$));
writedat("sqrt.dat", x, y, 3+2, 5+2);
printf($"After:"l$); FILE sqrt dat; INT errno = open(sqrt dat, "sqrt.dat", stand in channel); IF errno NE 0 THEN stop FI; on logical file end(sqrt dat, (REF FILE sqrt dat)BOOL: stop); TO UPB x DO STRING line; get(sqrt dat, (line, new line)); print((line,new line)) OD
)</lang>
- Output:
x before: +1.00000000000000e +0 +2.00000000000000e +0 +3.00000000000000e +0 +1.00000000000000e +11 y before: +1.00000000000000e +0 +1.41421356237310e +0 +1.73205080756888e +0 +3.16227766016838e +5 After: 1.000 1.00000 2.000 1.41421 3.000 1.73205 1e11 316228
AWK
As usual, the order of array traversal in AWK is not necessarily the same as the input had: <lang awk>$ awk 'BEGIN{split("1 2 3 1e11",x); > split("1 1.4142135623730951 1.7320508075688772 316227.76601683791",y); > for(i in x)printf("%6g %.5g\n",x[i],y[i])}' 1e+11 3.1623e+05
1 1 2 1.4142 3 1.7321</lang>
For the text file part of the task, just redirect stdout to it.
BBC BASIC
<lang bbcbasic> DIM x(3), y(3)
x() = 1, 2, 3, 1E11
FOR i% = 0 TO 3
y(i%) = SQR(x(i%))
NEXT
xprecision = 3
yprecision = 5
outfile% = OPENOUT("filename.txt")
IF outfile%=0 ERROR 100, "Could not create file"
FOR i% = 0 TO 3
@% = &1000000 + (xprecision << 8)
a$ = STR$(x(i%)) + CHR$(9)
@% = &1000000 + (yprecision << 8)
a$ += STR$(y(i%))
PRINT #outfile%, a$ : BPUT #outfile%, 10
NEXT
CLOSE #outfile%</lang>
- Output:
1 1 2 1.4142 3 1.7321 1E11 3.1623E5
C
<lang c>#include <stdio.h>
- include <math.h>
int main(int argc, char **argv) {
float x[4] = {1,2,3,1e11}, y[4];
int i = 0;
FILE *filePtr;
filePtr = fopen("floatArray","w");
for (i = 0; i < 4; i++) {
y[i] = sqrt(x[i]);
fprintf(filePtr, "%.3g\t%.5g\n", x[i], y[i]);
}
return 0;
}</lang>
The file "floatArray" then contains the following: <lang>1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05</lang>
C#
<lang csharp>using System.IO;
class Program {
static void Main(string[] args)
{
var x = new double[] { 1, 2, 3, 1e11 };
var y = new double[] { 1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791 };
int xprecision = 3;
int yprecision = 5;
string formatString = "{0:G" + xprecision + "}\t{1:G" + yprecision + "}";
using (var outf = new StreamWriter("FloatArrayColumns.txt"))
for (int i = 0; i < x.Length; i++)
outf.WriteLine(formatString, x[i], y[i]);
}
}</lang>
- Output:
1 1 2 1.4142 3 1.7321 1E+11 3.1623E+05
C++
Function writedat(): <lang cpp>template<class InputIterator, class InputIterator2> void writedat(const char* filename,
InputIterator xbegin, InputIterator xend,
InputIterator2 ybegin, InputIterator2 yend,
int xprecision=3, int yprecision=5)
{
std::ofstream f;
f.exceptions(std::ofstream::failbit | std::ofstream::badbit);
f.open(filename);
for ( ; xbegin != xend and ybegin != yend; ++xbegin, ++ybegin)
f << std::setprecision(xprecision) << *xbegin << '\t'
<< std::setprecision(yprecision) << *ybegin << '\n';
}</lang> Example: <lang cpp>#include <algorithm>
- include <cmath> // ::sqrt()
- include <fstream>
- include <iomanip> // setprecision()
- include <iostream>
- include <string>
- include <vector>
int main() {
try {
// prepare test data
double x[] = {1, 2, 3, 1e11};
const size_t xsize = sizeof(x) / sizeof(*x);
std::vector<double> y(xsize);
std::transform(&x[0], &x[xsize], y.begin(), ::sqrt);
// write file using default precisions
writedat("sqrt.dat", &x[0], &x[xsize], y.begin(), y.end());
// print the result file
std::ifstream f("sqrt.dat");
for (std::string line; std::getline(f, line); )
std::cout << line << std::endl;
}
catch(std::exception& e) {
std::cerr << "writedat: exception: '" << e.what() << "'\n";
return 1;
}
return 0;
}</lang>
- Result:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
COBOL
<lang COBOL>
identification division.
program-id. wr-float.
environment division.
input-output section.
file-control.
select report-file assign "float.txt"
organization sequential.
data division.
file section.
fd report-file
report is floats.
working-storage section.
1 i binary pic 9(4).
1 x-values comp-2.
2 value 1.0.
2 value 2.0.
2 value 3.0.
2 value 1.0e11.
1 redefines x-values comp-2.
2 x occurs 4.
1 comp-2.
2 y occurs 4.
report section.
rd floats.
1 float-line type de.
2 line plus 1.
3 column 1 pic -9.99e+99 source x(i).
2 column 12 pic -9.9999e+99 source y(i).
procedure division.
begin.
open output report-file
initiate floats
perform varying i from 1 by 1
until i > 4
compute y(i) = function sqrt (x(i))
generate float-line
end-perform
terminate floats
close report-file
stop run
.
end program wr-float.
</lang>
- Result:
1.00E+00 1.0000E+00 2.00E+00 1.4142E+00 3.00E+00 1.7321E+00 1.00E+11 3.1623E+05
Common Lisp
<lang lisp>(with-open-file (stream (make-pathname :name "filename") :direction :output)
(let* ((x (make-array 4 :initial-contents '(1 2 3 1e11)))
(y (map 'vector 'sqrt x))
(xprecision 3)
(yprecision 5)
(fmt (format nil "~~,1,~d,,G~~12t~~,~dG~~%" xprecision yprecision)))
(map nil (lambda (a b)
(format stream fmt a b)) x y)))</lang>
Using CLISP I get
1. 1.0000 2. 1.4142 3. 1.7321 1.0E+011 3.16228E+5
D
<lang d>import std.file, std.conv, std.string;
void main() {
auto x = [1.0, 2, 3, 1e11];
auto y = [1.0, 1.4142135623730951,
1.7320508075688772, 316227.76601683791];
int xPrecision = 3,
yPrecision = 5;
string tmp;
foreach (i, fx; x)
tmp ~= format("%." ~ text(xPrecision) ~ "g %." ~
text(yPrecision) ~ "g\r\n", fx, y[i]);
write("float_array.txt", tmp);
}</lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Elixir
<lang elixir>defmodule Write_float_arrays do
def task(xs, ys, fname, precision\\[]) do
xprecision = Keyword.get(precision, :x, 2)
yprecision = Keyword.get(precision, :y, 3)
format = "~.#{xprecision}g\t~.#{yprecision}g~n"
File.open!(fname, [:write], fn file ->
Enum.zip(xs, ys)
|> Enum.each(fn {x, y} -> :io.fwrite file, format, [x, y] end)
end)
end
end
x = [1.0, 2.0, 3.0, 1.0e11] y = for n <- x, do: :math.sqrt(n) fname = "filename.txt"
Write_float_arrays.task(x, y, fname) IO.puts File.read!(fname)
precision = [x: 3, y: 5] Write_float_arrays.task(x, y, fname, precision) IO.puts File.read!(fname)</lang>
- Output:
1.0 1.00 2.0 1.41 3.0 1.73 1.0e+11 3.16e+5 1.00 1.0000 2.00 1.4142 3.00 1.7321 1.00e+11 3.1623e+5
Erlang
Erlang thinks 1 is an integer. To persuade it otherwise I have to use 1.0.
<lang Erlang> -module( write_float_arrays ).
-export( [task/0, to_a_text_file/3, to_a_text_file/4] ).
task() -> File = "afile", Xs = [1.0, 2.0, 3.0, 1.0e11], Ys = [1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791], Options = [{xprecision, 3}, {yprecision, 5}], to_a_text_file( File, Xs, Ys, Options ), {ok, Contents} = file:read_file( File ), io:fwrite( "File contents: ~p~n", [Contents] ).
to_a_text_file( File, Xs, Ys ) -> to_a_text_file( File, Xs, Ys, [] ).
to_a_text_file( File, Xs, Ys, Options ) -> Xprecision = proplists:get_value( xprecision, Options, 2 ), Yprecision = proplists:get_value( yprecision, Options, 2 ), Format = lists:flatten( io_lib:format("~~.~pg ~~.~pg~n", [Xprecision, Yprecision]) ), {ok, IO} = file:open( File, [write] ), [ok = io:fwrite( IO, Format, [X, Y]) || {X, Y} <- lists:zip( Xs, Ys)], file:close( IO ). </lang>
- Output:
3> write_float_arrays:task(). File contents: <<"1.00 1.0000\n2.00 1.4142\n3.00 1.7321\n1.00e+11 3.1623e+5\n">>
Euphoria
<lang euphoria>constant x = {1, 2, 3, 1e11},
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}
integer fn
fn = open("filename","w") for n = 1 to length(x) do
printf(fn,"%.3g\t%.5g\n",{x[n],y[n]})
end for close(fn)</lang>
F#
<lang fsharp>[<EntryPoint>] let main argv =
let x = [ 1.; 2.; 3.; 1e11 ] let y = List.map System.Math.Sqrt x
let xprecision = 3 let yprecision = 5
use file = System.IO.File.CreateText("float.dat")
let line = sprintf "%.*g\t%.*g"
List.iter2 (fun x y -> file.WriteLine (line xprecision x yprecision y)) x y
0</lang>
Content of File, visualized with TAB=8
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Forth
<lang forth>create x 1e f, 2e f, 3e f, 1e11 f, create y 1e f, 2e fsqrt f, 3e fsqrt f, 1e11 fsqrt f,
- main
s" sqrt.txt" w/o open-file throw to outfile-id
4 0 do 4 set-precision x i floats + f@ f. 6 set-precision y i floats + f@ f. cr loop
outfile-id stdout to outfile-id close-file throw ;</lang>
Fortran
Fortran 90
<lang fortran>program writefloats
implicit none
real, dimension(10) :: a, sqrta integer :: i integer, parameter :: unit = 40
a = (/ (i, i=1,10) /) sqrta = sqrt(a)
open(unit, file="xydata.txt", status="new", action="write") call writexy(unit, a, sqrta) close(unit)
contains
subroutine writexy(u, x, y) real, dimension(:), intent(in) :: x, y integer, intent(in) :: u
integer :: i
write(u, "(2F10.4)") (x(i), y(i), i=lbound(x,1), ubound(x,1)) end subroutine writexy
end program writefloats</lang>
The arrays x and y should have same bounds (and size); this constraint is not checked.
Fortran 77
<lang fortran> program writefloats
integer i
double precision x(4), y(4)
data x /1d0, 2d0, 4d0, 1d11/
do 10 i = 1, 4
y = sqrt(x)
10 continue
open(unit=15, file='two_cols.txt', status='new')
write(15, '(f20.3,f21.4)') (x(i), y(i), i = 1, 4)
end</lang>
FreeBASIC
<lang freebasic>' FB 1.05.0 Win64
Dim x(0 To 3) As Double = {1, 2, 3, 1e11} Dim y(0 To 3) As Double = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}
Open "output.txt" For Output As #1 For i As Integer = 0 To 2
Print #1, Using "#"; x(i); Print #1, Spc(7); Using "#.####"; y(i)
Next Print #1, Using "#^^^^"; x(3); Print #1, Spc(2); Using "##.####^^^^"; y(3) Close #1</lang> Contents of output.txt :
- Output:
1 1.0000 2 1.4142 3 1.7321 1E+11 3.1623E+05
Go
<lang go>package main
import (
"fmt" "os"
)
var (
x = []float64{1, 2, 3, 1e11}
y = []float64{1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}
xprecision = 3 yprecision = 5
)
func main() {
if len(x) != len(y) {
fmt.Println("x, y different length")
return
}
f, err := os.Create("filename")
if err != nil {
fmt.Println(err)
return
}
for i := range x {
fmt.Fprintf(f, "%.*e, %.*e\n", xprecision-1, x[i], yprecision-1, y[i])
}
f.Close()
}</lang> File contents:
1.00e+00, 1.0000e+00 2.00e+00, 1.4142e+00 3.00e+00, 1.7321e+00 1.00e+11, 3.1623e+05
Haskell
Probably not very idiomatic but oh well <lang haskell>import System.IO import Text.Printf import Control.Monad
writeDat filename x y xprec yprec =
withFile filename WriteMode $ \h ->
-- Haskell's printf doesn't support a precision given as an argument for some reason, so we insert it into the format manually:
let writeLine = hPrintf h $ "%." ++ show xprec ++ "g\t%." ++ show yprec ++ "g\n" in
zipWithM_ writeLine x y</lang>
Example usage
Prelude> let x = [1, 2, 3, 1e11] Prelude> let y = map sqrt x Prelude> y [1.0,1.4142135623730951,1.7320508075688772,316227.7660168379] Prelude> writeDat "sqrt.dat" x y 3 5 Prelude> readFile "sqrt.dat" >>= putStr 1.000 1.00000 2.000 1.41421 3.000 1.73205 1.000e11 316227.76602
Alternative solution without Printf <lang haskell>import System.IO import Control.Monad import Numeric
writeDat filename x y xprec yprec =
withFile filename WriteMode $ \h ->
let writeLine a b = hPutStrLn h $ showGFloat (Just xprec) a "" ++ "\t" ++ showGFloat (Just yprec) b "" in
zipWithM_ writeLine x y</lang>
HicEst
<lang HicEst>REAL :: n=4, x(n), y(n) CHARACTER :: outP = "Test.txt"
OPEN(FIle = outP) x = (1, 2, 3, 1E11) y = x ^ 0.5 DO i = 1, n
WRITE(FIle=outP, Format='F5, F10.3') x(i), y(i)
ENDDO </lang> Alternative: Display or Edit the formatted arrays in a spreadsheet-like dialog with a common scroll bar. The menu More - Export - File writes the formatted arrays to a file: <lang HicEst>DLG(Text=x, Format='i12', Edit=y, Format='F10.2', Y=0)</lang>
Icon and Unicon
The following works in both languages.
<lang unicon>link printf
procedure main()
every put(x := [], (1 to 3) | 1e11)
every put(y := [], sqrt(!x))
every fprintf(open("filename","w"),"%10.2e %10.4e\n", x[i := 1 to *x], y[i])
end</lang>
Contents of filename after running:
->cat filename
1.00e0 1.0000e0
2.00e0 1.4142e0
3.00e0 1.7321e0
1.00e+11 3.1623e+5
->
IDL
; the data:
x = [1,2,3,1e11]
y=sqrt(x)
xprecision=3
yprecision=5
; NOT how one would do things in IDL, but in the spirit of the task - the output format:
form = string(xprecision,yprecision,format='("(G0.",I0.0,",1x,G0.",I0.0,")")')
; file I/O:
openw,unit,"datafile.txt",/get
for i = 1L, n_elements(x) do printf, unit, x[i-1],y[i-1],format=form
free_lun,unit
The file "datafile.txt" then contains the following:
<lang idl>1 1 2 1.4142 3 1.7321 1E+011 3.1623E+005</lang>
This is fairly ugly and un-IDLish. For example one shouldn't just rely on x and y having the same size. And if data is output in human-readable form, it should probably be lined up more nicely. And if it really has to be in two-column format with x and y side by side, one might consider running ASCII_Template or some such instead of that ugly hand-formatting.
J
<lang j>require 'files' NB. for fwrites
x =. 1 2 3 1e11 y =. %: x NB. y is sqrt(x)
xprecision =. 3 yprecision =. 5
filename =. 'whatever.txt'
data =. (0 j. xprecision,yprecision) ": x,.y
data fwrites filename</lang>
Or, more concisely:
<lang j>((0 j. 3 5) ": (,.%:) 1 2 3 1e11) fwrites 'whatever.txt' [ require 'fwrites'</lang>
This loses all of the inline comments and names, and instead relies on the reader's understanding of the purpose of each of the names (for example: 3 is the precision of the first column, and 5 is the precision of the second column).
Note that J's idea of precision here is "positions after the decimal point":
<lang j> (0 j. 3 5) ": (,.%:) 1 2 3 1e11
1.000 1.00000
2.000 1.41421
3.000 1.73205
100000000000.000 316227.76602</lang>
Java
<lang java5>import java.io.*;
public class FloatArray {
public static void writeDat(String filename, double[] x, double[] y,
int xprecision, int yprecision)
throws IOException {
assert x.length == y.length;
PrintWriter out = new PrintWriter(filename);
for (int i = 0; i < x.length; i++)
out.printf("%."+xprecision+"g\t%."+yprecision+"g\n", x[i], y[i]);
out.close();
}
public static void main(String[] args) {
double[] x = {1, 2, 3, 1e11};
double[] y = new double[x.length];
for (int i = 0; i < x.length; i++)
y[i] = Math.sqrt(x[i]);
try {
writeDat("sqrt.dat", x, y, 3, 5);
} catch (IOException e) {
System.err.println("writeDat: exception: "+e);
}
try {
BufferedReader br = new BufferedReader(new FileReader("sqrt.dat"));
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
} catch (IOException e) { }
}
}</lang>
Joy
<lang Joy> DEFINE write-floats == ['g 0] [formatf] enconcat map rollup ['g 0] [formatf] enconcat map swap zip "filename" "w" fopen swap [[fputchars] 9 fputch] step 10 fputch] step fclose. </lang>
Using it:
[1.0 2.0 3.0 1e11] 3 [1.0 1.41421356 1.73205080 316227.7660168] 5 write-floats.
jq
Program: <lang jq>[1, 2, 3, 1e11] as $x | $x | map(sqrt) as $y | range(0; $x|length) as $i | "\($x[$i]) \($y[$i])"</lang> Execution: To write the output to "filename": <lang sh>$ jq -n -r -f Write_float_arrays_to_a_text_file.jq > filename</lang>
Julia
<lang julia>xprecision = 3 yprecision = 5 x = round.([1, 2, 3, 1e11],xprecision) y = round.([1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791],yprecision) writedlm("filename", [x y], '\t')</lang>
Kotlin
<lang scala>// version 1.1.2
import java.io.File
fun main(args: Array<String>) {
val x = doubleArrayOf(1.0, 2.0, 3.0, 1e11)
val y = doubleArrayOf(1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791)
val xp = 3
val yp = 5
val f = "%.${xp}g\t%.${yp}g\n"
val writer = File("output.txt").writer()
writer.use {
for (i in 0 until x.size) {
val s = f.format(x[i], y[i])
writer.write(s)
}
}
}</lang>
Contents of 'output.txt':
1.00 1.0000 2.00 1.4142 3.00 1.7321 1.00e+11 3.1623e+05
Lingo
<lang lingo>on saveFloatLists (filename, x, y, xprecision, yprecision)
eol = numtochar(10) -- LF
fp = xtra("fileIO").new()
fp.openFile(tFile, 2)
cnt = x.count
repeat with i = 1 to cnt
the floatPrecision = xprecision
fp.writeString(string(x[i])
fp.writeString(TAB)
the floatPrecision = yprecision
fp.writeString(string(y[i])
fp.writeString(eol)
end repeat
fp.closeFile()
end</lang>
<lang lingo>x = [1.0, PI, sqrt(2)] y = [2.0, log(10), sqrt(3)] saveFloatLists("floats.txt", x, y, 3, 5)</lang>
Lua
<lang lua>filename = "file.txt"
x = { 1, 2, 3, 1e11 } y = { 1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791 }; xprecision = 3; yprecision = 5;
fstr = "%."..tostring(xprecision).."f ".."%."..tostring(yprecision).."f\n"
fp = io.open( filename, "w+" )
for i = 1, #x do
fp:write( string.format( fstr, x[i], y[i] ) )
end
io.close( fp )</lang>
Mathematica
<lang Mathematica>exportPrec[path_, data1_, data2_, prec1_, prec2_]:=Export[path,Transpose[{Map[ToString[NumberForm[#, prec2]] &, data2],Map[ToString[NumberForm[#, prec1]] &, data1]}], "Table"]</lang>
MATLAB / Octave
<lang Matlab> x = [1, 2, 3, 1e11];
y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791];
fid = fopen('filename','w')
fprintf(fid,'%.3g\t%.5g\n',[x;y]);
fclose(fid); </lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Mercury
<lang Mercury>:- module write_float_arrays.
- - interface.
- - import_module io.
- - pred main(io::di, io::uo) is det.
- - implementation.
- - import_module float, list, math, string.
main(!IO) :-
io.open_output("filename", OpenFileResult, !IO),
(
OpenFileResult = ok(File),
X = [1.0, 2.0, 3.0, 1e11],
list.foldl_corresponding(write_dat(File, 3, 5), X, map(sqrt, X), !IO),
io.close_output(File, !IO)
;
OpenFileResult = error(IO_Error),
io.stderr_stream(Stderr, !IO),
io.format(Stderr, "error: %s\n", [s(io.error_message(IO_Error))], !IO),
io.set_exit_status(1, !IO)
).
- - pred write_dat(text_output_stream::in, int::in, int::in, float::in,
float::in, io::di, io::uo) is det.
write_dat(File, XPrec, YPrec, X, Y, !IO) :-
io.format(File, "%.*g\t%.*g\n", [i(XPrec), f(X), i(YPrec), f(Y)], !IO).</lang>
File contents:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
NetRexx
<lang NetRexx>/* NetRexx */
options replace format comments java crossref savelog symbols nobinary
-- Invent a target text file name based on this program's source file name parse source . . pgmName '.nrx' . outFile = pgmName || '.txt'
do
formatArrays(outFile, [1, 2, 3, 1e+11], [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791])
catch ex = Exception
ex.printStackTrace
end
return
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- This function formats the input arrays. -- It has defaults for the x & y precision values of 3 & 5 -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ method formatArrays(outFile, xf = Rexx[], yf = Rexx[], xprecision = 3, yprecision = 5) -
public static signals IllegalArgumentException, FileNotFoundException, IOException
if xf.length > yf.length then signal IllegalArgumentException('Y array must be at least as long as X array')
fw = BufferedWriter(OutputStreamWriter(FileOutputStream(outFile)))
loop i_ = 0 to xf.length - 1 row = xf[i_].format(null, xprecision, null, xprecision).left(15) yf[i_].format(null, yprecision, null, yprecision) (Writer fw).write(String row) fw.newLine end i_ fw.close
return
</lang>
- Output:
1.000 1.00000 2.000 1.41421 3.000 1.73205 1.000E+11 3.16228E+5
NewLISP
<lang NewLISP>; file: write-float-array.lsp
- url
- http://rosettacode.org/wiki/Write_float_arrays_to_a_text_file
- author
- oofoe 2012-01-30
- The "transpose" function is used to flip the joined lists around so
- that it's easier to iterate through them together.
(define (write-float-array x xp y yp filename)
(let ((f (format "%%-10.%dg %%-10.%dg" xp yp))
(o (open filename "write")))
(dolist (v (transpose (list x y)))
(write-line o (format f (v 0) (v 1))))
(close o)
))
- Test
(write-float-array
'(1 2 3 1e11) 3 '(1 1.4142135623730951 1.7320508075688772 316227.76601683791) 5 "filename.chan")
(println "File contents:") (print (read-file "filename.chan"))
(exit)</lang>
- Output:
File contents: 1 1 2 1.4142 3 1.7321 1e+011 3.1623e+005
Nim
<lang nim>import strutils, math, sequtils
const
outFileName = "floatarr2file.txt"
proc sqrt*(x: int64): float {.importc: "sqrt", header: "<math.h>".}
const
xprecision = 3 yprecision = 5
var a: seq[int64] = @[int64(1), 2, 3, 100_000_000_000] var b: seq[float] = @[sqrt(a[0]), sqrt(a[1]), sqrt(a[2]), sqrt(a[3])] var c = zip(a,b) var res: string = "" for t in c:
res.add($formatFloat(float(t.a),ffDefault,xprecision) & "\t" & $formatFloat(t.b,ffDefault,yprecision) & "\n")
writeFile(outFileName,res) var res2 = readFile(outFileName) echo(res2)</lang>
- Output:
1.00 1.0000 2.00 1.4142 3.00 1.7321 1.00e+11 3.1623e+05
OCaml
<lang ocaml>let write_dat filename x y ?(xprec=3) ?(yprec=5) () =
let oc = open_out filename in let write_line a b = Printf.fprintf oc "%.*g\t%.*g\n" xprec a yprec b in List.iter2 write_line x y; close_out oc</lang>
Example usage
# let x = [1.0; 2.0; 3.0; 1e11];;
val x : float list = [1.; 2.; 3.; 100000000000.]
# let y = List.map sqrt x;;
val y : float list =
[1.; 1.41421356237309515; 1.73205080756887719; 316227.766016837908]
# write_dat "sqrt.dat" x y ();;
- : unit = ()
# let ic = open_in "sqrt.dat";;
val ic : in_channel = <abstr>
# try
while true do
print_endline (input_line ic)
done
with End_of_file -> ();;
1 1
2 1.4142
3 1.7321
1e+11 3.1623e+05
- : unit = ()
PARI/GP
<lang parigp>f(x,pr)={ Strprintf(if(x>=10^pr, Str("%.",pr-1,"e") , Str("%.",pr-#Str(x\1),"f") ),x) }; wr(x,y,xprec,yprec)={ for(i=1,#x, write("filename",f(x[i],xprec),"\t",f(y[i],yprec)) ) };</lang>
Pascal
<lang pascal>Program WriteNumbers;
const
x: array [1..4] of double = (1, 2, 3, 1e11); xprecision = 3; yprecision = 5; baseDigits = 7;
var
i: integer; filename: text;
begin
assign (filename, 'filename'); rewrite (filename); for i := 1 to 4 do writeln (filename, x[i]:baseDigits+xprecision, sqrt(x[i]):baseDigits+yprecision); close (filename);
end.</lang> File contents
1.00E+000 1.0000E+000 2.00E+000 1.4142E+000 3.00E+000 1.7321E+000 1.00E+011 3.1623E+005
Perl
<lang perl>use autodie;
sub writedat {
my ($filename, $x, $y, $xprecision, $yprecision) = @_;
open my $fh, ">", $filename;
for my $i (0 .. $#$x) {
printf $fh "%.*g\t%.*g\n", $xprecision||3, $x->[$i], $yprecision||5, $y->[$i];
}
close $fh;
}
my @x = (1, 2, 3, 1e11); my @y = map sqrt, @x;
writedat("sqrt.dat", \@x, \@y);</lang> File contents
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Alternatively, with the CPAN List::MoreUtils package:
<lang perl>use autodie; use List::MoreUtils qw(each_array);
sub writedat {
my ($filename, $x, $y, $xprecision, $yprecision) = @_; open my $fh, ">", $filename;
my $ea = each_array(@$x, @$y);
while ( my ($i, $j) = $ea->() ) {
printf $fh "%.*g\t%.*g\n", $xprecision||3, $i, $yprecision||5, $j;
}
close $fh;
}
my @x = (1, 2, 3, 1e11); my @y = map sqrt, @x;
writedat("sqrt.dat", \@x, \@y);</lang>
Perl 6
Perl 5-ish
Written in the style of the 2nd Perl 5 example. <lang perl6>sub write float ( $filename, @x, @y, $x_precision = 3, $y_precision = 5 ) {
my $fh = open $filename, :w;
for flat @x Z @y -> $x, $y {
$fh.printf: "%.*g\t%.*g\n", $x_precision, $x, $y_precision, $y;
}
$fh.close;
}
my @x = 1, 2, 3, 1e11; my @y = @x.map({.sqrt});
writefloat( 'sqrt.dat', @x, @y );</lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Idiomatic
Written in a more idiomatic style. <lang perl6>sub writefloat($filename, @x, @y, :$x-precision = 3, :$y-precision = 3) {
open($filename, :w).print:
join , flat (@x>>.fmt("%.{$x-precision}g") X "\t") Z (@y>>.fmt("%.{$y-precision}g") X "\n");
} my @x = 1, 2, 3, 1e11; writefloat('sqrt.dat', @x, @x>>.sqrt, :y-precision(5));</lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Phix
Copy of Euphoria <lang Phix>constant x = {1, 2, 3, 1e11},
y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}
integer fn = open("filename","w") for i=1 to length(x) do
printf(fn,"%.3g\t%.5g\n",{x[i],y[i]})
end for close(fn)</lang> File contents:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+5
PicoLisp
An exponential format like "1e11" is not supported <lang PicoLisp>(setq *Xprecision 3 *Yprecision 5)
(scl 7) (mapc
'((X Y)
(prinl
(round X *Xprecision)
" "
(round Y *Yprecision) ) )
(1.0 2.0 3.0)
(1.0 1.414213562 1.732050807) )</lang>
- Output:
1.000 1.00000 2.000 1.41421 3.000 1.73205
PL/I
<lang PL/I>*Process source attributes xref;
aaa: Proc Options(main);
declare X(5) float (9) initial (1, 2, 3, 4, 5),
Y(5) float (18) initial (9, 8, 7, 6, 1e9);
declare (x_precision, y_precision) fixed binary;
Dcl out stream output;
open file(out) title('/OUT.TXT,type(text),recsize(100)');
x_precision = 9;
y_precision = 16;
put file(out) edit((X(i),Y(i) do i=1 to 5))
(skip,e(19,x_precision),
x(2),e(24,y_precision));
end;</lang>
- Output:
1.000000000E+0000 9.0000000000000000E+0000 2.000000000E+0000 8.0000000000000000E+0000 3.000000000E+0000 7.0000000000000000E+0000 4.000000000E+0000 6.0000000000000000E+0000 5.000000000E+0000 1.0000000000000000E+0009
PowerShell
<lang PowerShell> $x = @(1, 2, 3, 1e11) $y = @(1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791) $xprecision = 3 $yprecision = 5 $arr = foreach($i in 0..($x.count-1)) {
[pscustomobject]@{x = "{0:g$xprecision}" -f $x[$i]; y = "{0:g$yprecision}" -f $y[$i]}
} $arr | format-table -HideTableHeaders > filename.txt </lang> Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
PureBasic
<lang PureBasic>#Size = 4
DataSection
Data.f 1, 2, 3, 1e11 ;x values, how many values needed is determined by #Size
EndDataSection
Dim x.f(#Size - 1) Dim y.f(#Size - 1)
Define i For i = 0 To #Size - 1
Read.f x(i) y(i) = Sqr(x(i))
Next
Define file$, fileID, xprecision = 3, yprecision = 5, output$
file$ = SaveFileRequester("Text file for float data", "xydata.txt","Text file | *.txt", 0) If file$
fileID = OpenFile(#PB_Any, file$)
If fileID
For i = 0 To #Size - 1
output$ = StrF(x(i), xprecision) + Chr(9) + StrF(y(i), yprecision)
WriteStringN(fileID, output$)
Next
CloseFile(fileID)
EndIf
EndIf</lang>
- Output:
to text file
1.000 1.00000 2.000 1.41421 3.000 1.73205 99999997952.000 316227.75000
Python
<lang python>import itertools def writedat(filename, x, y, xprecision=3, yprecision=5):
with open(filename,'w') as f:
for a, b in itertools.izip(x, y):
print >> f, "%.*g\t%.*g" % (xprecision, a, yprecision, b)</lang>
Example usage <lang python>>>> import math >>> x = [1, 2, 3, 1e11] >>> y = map(math.sqrt, x) >>> y [1.0, 1.4142135623730951, 1.7320508075688772, 316227.76601683791] >>> writedat("sqrt.dat", x, y) >>> # check ... >>> for line in open('sqrt.dat'): ... print line, ... 1 1 2 1.4142 3 1.7321 1e+011 3.1623e+005</lang>
<lang python>def writedat(filename, x, y, xprecision=3, yprecision=5):
with open(filename,'w') as f:
for a, b in zip(x, y):
print("%.*g\t%.*g" % (xprecision, a, yprecision, b), file=f)
#or, using the new-style formatting:
#print("{1:.{0}g}\t{3:.{2}g}".format(xprecision, a, yprecision, b), file=f)</lang>
R
<lang R>writexy <- function(file, x, y, xprecision=3, yprecision=3) {
fx <- formatC(x, digits=xprecision, format="g", flag="-") fy <- formatC(y, digits=yprecision, format="g", flag="-") dfr <- data.frame(fx, fy) write.table(dfr, file=file, sep="\t", row.names=F, col.names=F, quote=F)
}
x <- c(1, 2, 3, 1e11) y <- sqrt(x) writexy("test.txt", x, y, yp=5)</lang>
Racket
<lang Racket>
- lang racket
(define xs '(1.0 2.0 3.0 1.0e11)) (define ys '(1.0 1.4142135623730951 1.7320508075688772 316227.76601683791))
(define xprecision 3) (define yprecision 5)
(with-output-to-file "some-file" #:exists 'truncate
(λ() (for ([x xs] [y ys])
(displayln (~a (~r x #:precision xprecision)
" "
(~r y #:precision yprecision))))))
- |
The output is not using exponenets as above, but that's not needed since Racket can read these numbers fine:
1 1 2 1.41421 3 1.73205 100000000000 316227.76602 |# </lang>
Raven
<lang Raven>3 as $xprecision 5 as $yprecision
[ ] as $results
[ 1 2 3 1e11 ] as $a
group
$a each sqrt
list as $b
- generate format specifier "%-8.3g %.5g\n"
"%%-8.%($xprecision)dg %%.%($yprecision)dg\n" as $f
define print2 use $v1, $v2, $f
$v2 1.0 prefer $v1 1.0 prefer $f format $results push
4 each as $i
$f $b $i get $a $i get print2
$results "" join "results.dat" write</lang>
- Output:
results.dat file contains:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
REXX
<lang rexx>/*REXX program writes two arrays to a file with a specified (limited) precision. */ numeric digits 1000 /*allow use of a huge number of digits.*/ oFID= 'filename' /*name of the output File IDentifier.*/ x.=; y.=; x.1= 1 ; y.1= 1
x.2= 2 ; y.2= 1.4142135623730951
x.3= 3 ; y.3= 1.7320508075688772
x.4= 1e11 ; y.4= 316227.76601683791
xPrecision= 3 /*the precision for the X numbers. */ yPrecision= 5 /* " " " " Y " */
do j=1 while x.j\== /*process and reformat all the numbers.*/
newX=rule(x.j, xPrecision) /*format X numbers with new precision*/
newY=rule(y.j, yPrecision) /* " Y " " " " */
aLine=translate(newX || left(,4) || newY, "e", 'E')
say aLine /*display re─formatted numbers ──► term*/
call lineout oFID, aLine /*write " " " disk*/
end /*j*/
exit /*stick a fork in it, we're all done. */ /*──────────────────────────────────────────────────────────────────────────────────────*/ rule: procedure; parse arg z 1 oz,p; numeric digits p; z=format(z,,p)
parse var z mantissa 'E' exponent /*get the dec dig exponent*/
parse var mantissa int '.' fraction /* " integer and fraction*/
fraction=strip(fraction, 'T', 0) /*strip trailing zeroes.*/
if fraction\== then fraction="."fraction /*any fractional digits ? */
if exponent\== then exponent="E"exponent /*in exponential format ? */
z=int || fraction || exponent /*format # (as per rules)*/
if datatype(z,'W') then return format(oz/1,,0) /*is it a whole number ? */
return format(oz/1,,,3,0) /*3 dec. digs in exponent.*/</lang>
output when using the default (internal) data:
1 1 2 1.4142 3 1.7321 1e+011 3.1623e+005
Ring
<lang ring>
- Project : Write float arrays to a text file
decimals(13) x = [1, 2, 3, 100000000000] y = [1, 1.4142135623730, 1.7320508075688, 316227.76601683] str = list(4) fn = "C:\Ring\calmosoft\output.txt" fp = fopen(fn,"wb") for i = 1 to 4
str[i] = string(x[i]) + " | " + string(y[i]) + windowsnl()
fwrite(fp, str[i])
next fclose(fp) fp = fopen("C:\Ring\calmosoft\output.txt","r") r = "" while isstring(r)
r = fgetc(fp)
if r = char(10) see nl
else see r ok
end fclose(fp) </lang> Output:
1 | 1 2 | 1.4142135623730 3 | 1.7320508075688 100000000000.0000000000000 | 316227.76601683
RLaB
In RLaB this task can be done in two ways:
1. Direct writing of the numerical data to the file of an array using function writem. Here the writing format is specified using the global property that is accessible through function format. <lang RLaB> >> x = rand(10,1); y = rand(10,1); >> writem("mytextfile.txt", [x,y]); </lang>
2. Converting the numerical data to text, and then writing the text to the file, using the same function writem. Here, the writing format is specified through text function, and the result is written as a plain string matrix. <lang RLaB> >> x = rand(10,1); y = rand(10,1); >> s = text( [x,y], "%10.8f" ); >> writem("mytextfile.txt", s); </lang>
Please note, writem function in RLaB can operate in two-fold fashion. RLaB keeps track of the open files that were created using the built-in function open.
If user writes the data to a file using open followed by writem then RLaB opens the file in append mode if it already hasn't been opened. If it has been, then the command open is ignored (say in batch mode). Then, each successive call to writem appends newest data to the end of the file while keeping the file open. RLaB will close the file (and OS will flush its file buffer) upon the command close.
If user writes the data to a file by using only writem then the RLaB temporarily opens the file, writes the data to it, and then closes the file. Successive calls to writem in this mode will erase the previous content of the file.
Ruby
<lang ruby># prepare test data x = [1, 2, 3, 1e11] y = x.collect { |xx| Math.sqrt xx } xprecision = 3 yprecision = 5
- write the arrays
open('sqrt.dat', 'w') do |f|
x.zip(y) { |xx, yy| f.printf("%.*g\t%.*g\n", xprecision, xx, yprecision, yy) }
end
- print the result file
open('sqrt.dat', 'r') { |f| puts f.read }</lang> Result:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
Run BASIC
<lang runbasic>x$ = "1, 2, 3, 1e11" y$ = "1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791"
open "filename" for output as #f ' Output to "filename" for i = 1 to 4
print #f, using("##############.###",val(word$(x$,i,",")));"|";using("#######.#####",val(word$(y$,i,",")))
next i close #f</lang>
- Output:
1.000| 1.00000
2.000| 1.41421
3.000| 1.73205
100000000000.000| 316227.76602
SAS
<lang sas>data _null_; input x y; file "output.txt"; put x 12.3 " " y 12.5; cards; 1 1 2 1.4142135623730951 3 1.7320508075688772 1e11 316227.76601683791
run;</lang>
Scala
<lang scala>import java.io.{File, FileWriter, IOException}
object FloatArray extends App {
val x: List[Float] = List(1f, 2f, 3f, 1e11f)
def writeStringToFile(file: File, data: String, appending: Boolean = false) = using(new FileWriter(file, appending))(_.write(data))
def using[A <: {def close() : Unit}, B](resource: A)(f: A => B): B =
try f(resource) finally resource.close()
try {
val file = new File("sqrt.dat")
using(new FileWriter(file))(writer => x.foreach(x => writer.write(f"$x%.3g\t${math.sqrt(x)}%.5g\n")))
} catch {
case e: IOException => println(s"Running Example failed: ${e.getMessage}")
}
}</lang>
Seed7
The library math.s7i defines the function sqrt. The operators sci and exp (defined in float.s7i) support writing floating point numbers in scientific notation.<lang seed7>$ include "seed7_05.s7i";
include "float.s7i"; include "math.s7i";
const proc: main is func
local
const array float: numbers is [] (1.0, 2.0, 3.0, 1.0e11);
var float: aFloat is 0.0;
var file: aFile is STD_NULL;
begin
aFile := open("filename", "w");
for aFloat range numbers do
writeln(aFile, aFloat sci 3 exp 2 <& " " <& sqrt(aFloat) sci 5 exp 2);
end for;
close(aFile);
end func;</lang>
- Result file filename:
1.000e+00 1.00000e+00 2.000e+00 1.41421e+00 3.000e+00 1.73205e+00 1.000e+11 3.16228e+05
Sidef
<lang ruby>func writedat(filename, x, y, x_precision=3, y_precision=5) {
var fh = File(filename).open_w
for a,b in (x ~Z y) {
fh.printf("%.*g\t%.*g\n", x_precision, a, y_precision, b)
}
fh.close
} var x = [1, 2, 3, 1e11] var y = x.map{.sqrt} writedat('sqrt.dat', x, y)</lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
SPL
<lang spl>x = [1, 2, 3, 10^11] y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791] xprecision = 3 yprecision = 5 > i, 1..4
s1 = #.str(x[i],"g"+xprecision)
s2 = #.str(y[i],"g"+yprecision)
#.writeline("file.txt",s1+#.tab+s2)
<</lang>
Standard ML
<lang sml>fun writeDat (filename, x, y, xprec, yprec) = let
val os = TextIO.openOut filename
fun write_line (a, b) =
TextIO.output (os, Real.fmt (StringCvt.GEN (SOME xprec)) a ^ "\t" ^
Real.fmt (StringCvt.GEN (SOME yprec)) b ^ "\n")
in
ListPair.appEq write_line (x, y); TextIO.closeOut os
end;</lang> Example usage
- val x = [1.0, 2.0, 3.0, 1e11];
val x = [1.0,2.0,3.0,100000000000.0] : real list
- val y = map Math.sqrt x;
val y = [1.0,1.41421356237,1.73205080757,316227.766017] : real list
- writeDat ("sqrt.dat", x, y, 3, 5);
val it = () : unit
- val is = TextIO.openIn "sqrt.dat";
val is = - : TextIO.instream
- print (TextIO.inputAll is);
1.0 1.0
2.0 1.4142
3.0 1.7321
1E11 3.1623E05
val it = () : unit
Stata
<lang stata>* Create the dataset clear mat x=1\2\3\1e11 svmat double x ren *1 * gen y=sqrt(x) format %10.1g x format %10.5g y
- Save as text file
export delim file.txt, delim(" ") novar datafmt replace</lang>
- Output:
1 1 2 1.4142 3 1.7321 1.0e+11 316228
Tcl
<lang tcl>set x {1 2 3 1e11} foreach a $x {lappend y [expr {sqrt($a)}]} set fh [open sqrt.dat w] foreach a $x b $y {
puts $fh [format "%.*g\t%.*g" $xprecision $a $yprecision $b]
} close $fh
set fh [open sqrt.dat] puts [read $fh [file size sqrt.dat]] close $fh</lang>
- Output:
1 1 2 1.4142 3 1.7321 1e+011 3.1623e+005
VBA
<lang vb>Public Sub main()
x = [{1, 2, 3, 1e11}]
y = [{1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}]
Dim TextFile As Integer
TextFile = FreeFile
Open "filename" For Output As TextFile
For i = 1 To UBound(x)
Print #TextFile, Format(x(i), "0.000E-000"), Format(y(i), "0.00000E-000")
Next i
Close TextFile
End Sub</lang>
- Output:
1,000E000 1,00000E000 2,000E000 1,41421E000 3,000E000 1,73205E000 1,000E011 3,16228E005
Yabasic
<lang Yabasic>x$ = "1 2 3 1e11" pr1 = 3 : pr2 = 5
dim x$(1) n = token(x$, x$())
f = open("filename.txt", "w")
for i = 1 to n print #f str$(val(x$(i)), "%1." + str$(pr1) + "g") + "\t" + str$(sqrt(val(x$(i))), "%1." + str$(pr2) + "g") next i
close #f</lang>
zkl
<lang zkl>fcn writeFloatArraysToFile(filename, xs,xprecision, ys,yprecision){
f :=File(filename,"w");
fmt:="%%.%dg\t%%.%dg".fmt(xprecision,yprecision).fmt; // "%.3g\t%.5g".fmt
foreach x,y in (xs.zip(ys)){ f.writeln(fmt(x,y)); }
f.close();
}
xs,ys := T(1.0, 2.0, 3.0, 1e11), xs.apply("sqrt"); xprecision,yprecision := 3,5; writeFloatArraysToFile("floatArray.txt", xs,xprecision, ys,yprecision);</lang>
- Output:
$ cat floatArray 1 1 2 1.4142 3 1.7321 1e+11 3.1623e+05
ZX Spectrum Basic
The ZX Spectrum has a dedicated file format for floating point arrays. Although this format is not a text file, it would be the usual format for writing such data to a file on a ZX Spectrum. Here we write the contents of the array g() to a file:
<lang zxbasic>SAVE "myarray" DATA g()</lang>