Continued fraction: Difference between revisions
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→{{header|Fōrmulæ}}
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2.7182818284590452354
3.1415926228048469486</pre>
=={{header|dc}}==
<syntaxhighlight lang="dc">[20k 0 200 si [li lbx r li lax + / li 1 - dsi 0<:]ds:x 0 lax +]sf
[[2q]s2[0<2 1]sa[R1]sb]sr # sqrt(2)
[[R2q]s2[d 0=2]sa[R1q]s1[d 1=1 1-]sb]se # e
[[3q]s3[0=3 6]sa[2*1-d*]sb]sp # pi
c lex lfx p
lrx lfx p
lpx lfx p</syntaxhighlight>
{{out}}
<pre>3.14159262280484694855
1.41421356237309504880
2.71828182845904523536</pre>
20 decimal places and 200 iterations.
=={{header|EasyLang}}==
<syntaxhighlight lang="easylang">
numfmt 8 0
func calc_sqrt .
n = 100
sum = n
while n >= 1
a = 1
if n > 1
a = 2
.
b = 1
sum = a + b / sum
n -= 1
.
return sum
.
func calc_e .
n = 100
sum = n
while n >= 1
a = 2
if n > 1
a = n - 1
.
b = 1
if n > 1
b = n - 1
.
sum = a + b / sum
n -= 1
.
return sum
.
func calc_pi .
n = 100
sum = n
while n >= 1
a = 3
if n > 1
a = 6
.
b = 2 * n - 1
b *= b
sum = a + b / sum
n -= 1
.
return sum
.
print calc_sqrt
print calc_e
print calc_pi
</syntaxhighlight>
=={{header|Elixir}}==
<syntaxhighlight lang="elixir">
defmodule CFrac do
def compute([a | _], []), do: a
def compute([a | as], [b | bs]), do: a + b/compute(as, bs)
def sqrt2 do
a = [1 | Stream.cycle([2]) |> Enum.take(1000)]
b = Stream.cycle([1]) |> Enum.take(1000)
IO.puts compute(a, b)
end
def exp1 do
a = [2 | Stream.iterate(1, &(&1 + 1)) |> Enum.take(1000)]
b = [1 | Stream.iterate(1, &(&1 + 1)) |> Enum.take(999)]
IO.puts compute(a, b)
end
def pi do
a = [3 | Stream.cycle([6]) |> Enum.take(1000)]
b = 1..1000 |> Enum.map(fn k -> (2*k - 1)**2 end)
IO.puts compute(a, b)
end
end
</syntaxhighlight>
{{out}}
<pre>
>elixir -e CFrac.sqrt2()
1.4142135623730951
>elixir -e CFrac.exp1()
2.7182818284590455
>elixir -e CFrac.pi()
3.141592653340542
</pre>
=={{header|Erlang}}==
Line 1,584 ⟶ 1,694:
{{FormulaeEntry|page=https://formulae.org/?script=examples/Continued_fraction}}
'''Solution'''
The following function definition creates a continued fraction:
[[File:Fōrmulæ - Continued fraction 01.png]]
The function accepts the following parameters:
{| class="wikitable" style="margin:auto"
|-
! Parameter !! Description
|-
| a₀ || Value for a₀
|-
| λa || Lambda expression to define aᵢ
|-
| λb || Lambda expression to define bᵢ
|-
| depth || Depth to calculate the continued fraction
|}
Since Fōrmulæ arithmetic simplifies numeric results as they are generated, the result is not a continued fraction by default.
If we want to create the structure, we can introduce the parameters as string or text expressions (or lambda expressions that produce them). Because string or text expressions are not reduced when they are operands of additions and divisions, the structure is preserved, such as follows:
[[File:Fōrmulæ - Continued fraction 02.png]]
[[File:Fōrmulæ - Continued fraction 03.png]]
'''Case 1.''' <math>\sqrt 2</math>
In this case
* a₀ is 1
* λa is n ↦ 2
* λb is n ↦ 1
Let us show the results as a table, for several levels of depth (1 to 10).
The columns are:
* The depth
* The "textual" call, in order to generate the structure
* The normal (numeric) call. Since arithmetic operations are exact by default, it is usually a rational number.
* The value of the normal (numeric) call, forced to be shown as a decimal number, by using the Math.Numeric expression (the N(x) expression)
[[File:Fōrmulæ - Continued fraction 04.png]]
[[File:Fōrmulæ - Continued fraction 05.png]]
'''Case 2.''' <math>e</math>
In this case
* a₀ is 2
* λa is n ↦ n
* λb is n ↦ 1 if n = 1, n - 1 elsewhere
[[File:Fōrmulæ - Continued fraction 06.png]]
[[File:Fōrmulæ - Continued fraction 07.png]]
'''Case 3.''' <math>\pi</math>
In this case
* a₀ is 3
* λa is n ↦ 6
* λb is n ↦ 2(n - 1)²
[[File:Fōrmulæ - Continued fraction 08.png]]
[[File:Fōrmulæ - Continued fraction 09.png]]
=={{header|Go}}==
Line 3,247 ⟶ 3,431:
≫ ≫ ‘'''→CFRAC'''’ STO
|
'''→CFRAC''' ''( a0
Unstack an and bn
Loop from N to 2
Calculate
Decrement counter
Calculate last fraction with b1 in stack, then add a0
Line 3,852 ⟶ 4,036:
=={{header|Wren}}==
{{trans|D}}
<syntaxhighlight lang="
var t = 0
for (i in n..1) {
| |||