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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
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Task/Map-range/Racket/map-range.rkt Normal file
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@ -0,0 +1,10 @@
#lang racket
(define (make-range-map a1 a2 b1 b2)
;; returns a mapping function, doing computing the differences in
;; advance so it's fast
(let ([a (- a2 a1)] [b (- b2 b1)])
(λ(s) (exact->inexact (+ b1 (/ (* (- s a1) b) a))))))
(define map (make-range-map 0 10 -1 0))
(for ([i (in-range 0 11)]) (printf "~a --> ~a\n" i (map i)))