diff options
| -rw-r--r-- | net/ricketyspace/sicp/one/twentynine.scm | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/net/ricketyspace/sicp/one/twentynine.scm b/net/ricketyspace/sicp/one/twentynine.scm index 1dfdc45..5d1af80 100644 --- 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 + |