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Frozen Fish 2: PC
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d09xx
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differ.scm
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1993-01-02
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301b
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13 lines
(define (deriv f h)
(lambda (x)
(/ (- (f (+ h x)) (f x)) h)))
(define (integral f a b dx)
(define (add-dx z) (+ z dx))
(sum f add-dx (+ a (/ dx 2)) b))
(define (sum f next x y)
(if (> x y)
0
(+ (f x) (sum f next (next x) y))))