sicp

sicp sandbox.
git clone git://git.ricketyspace.net/sicp.git
Log | Files | Refs

commit b0170945a60133e0468161e069b3d817502f9091
parent 39c264bbafc10ad9997c21ae36995ab179d8d2b9
Author: rsiddharth <s@ricketyspace.net>
Date:   Mon, 25 Sep 2017 02:27:07 +0000

net: Update (net ricketyspace sicp one twentynine)

* net/ricketyspace/sicp/one/twentynine.scm (simpsons): Rename function
to `simpson`; Add comments.

Diffstat:
net/ricketyspace/sicp/one/twentynine.scm | 13+++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/ricketyspace/sicp/one/twentynine.scm b/net/ricketyspace/sicp/one/twentynine.scm @@ -3,7 +3,7 @@ ;;;; <https://creativecommons.org/licenses/by-sa/4.0/>. (define-module (net ricketyspace sicp one twentynine) - #:export (simpsons)) + #:export (simpson)) (define (sum term a next b) (if (> a b) @@ -11,7 +11,7 @@ (+ (term a) (sum term (next a) next b)))) -(define (simpsons f a b n) +(define (simpson f a b n) (let* ((h (/ (- b a) (* 1.0 n))) (y (lambda (k) (+ a (* k h)))) (ce (lambda (k) ;coefficient @@ -23,3 +23,12 @@ (next (lambda (k) (1+ k)))) (* (/ h 3.0) (sum term 0 next n)))) + +;;; Guile REPL +;;; scheme@(guile-user)> ,use (net ricketyspace sicp one twentynine) +;;; scheme@(guile-user)> (define (cube x) (* x x x)) +;;; scheme@(guile-user)> (simpson cube 0 1 100) +;;; $23 = 0.24999999999999992 +;;; scheme@(guile-user)> (simpson cube 0 1 1000) +;;; $24 = 0.2500000000000003 +