aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

23
Task/Arithmetic-geometric-mean-Calculate-Pi/Racket/arithmetic-geometric-mean-calculate-pi.rkt Normal file
View file

@ -0,0 +1,23 @@
#lang racket
(require math/bigfloat)
(define (pi/a-g rep)
(let loop ([a 1.bf]
[g (bf1/sqrt 2.bf)]
[z (bf/ 1.bf 4.bf)]
[n (bf 1)]
[r 0])
(if (< r rep)
(let* ([a-p (bf/ (bf+ a g) 2.bf)]
[g-p (bfsqrt (bf* a g))]
[z-p (bf- z (bf* (bfsqr (bf- a-p a)) n))])
(loop a-p g-p z-p (bf* n 2.bf) (add1 r)))
(bf/ (bfsqr a) z))))
(parameterize ([bf-precision 100])
(displayln (bigfloat->string (pi/a-g 5)))
(displayln (bigfloat->string pi.bf)))
(parameterize ([bf-precision 200])
(displayln (bigfloat->string (pi/a-g 6)))
(displayln (bigfloat->string pi.bf)))