Created
August 13, 2013 08:11
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sicp 2.9 Радиус (width) интервала определяется как половина расстояния между его верхней и
нижней границами. Радиус является мерой неопределенности числа, которое обозначает
интервал. Есть такие математические операции, для которых радиус результата зависит
только от радиусов интервалов-аргументов, а есть такие, для которых радиус результата
не …
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(define (make-interval a b) (cons a b)) | |
(define (upper-bound x) (car x)) | |
(define (lower-bound x) (cdr x)) | |
(define (width x) (- (cdr x) (car x))) | |
(define (sub-interval a b) | |
(make-interval | |
(- (upper-bound a) (lower-bound b)) | |
(- (lower-bound a) (upper-bound b)) | |
) | |
) | |
(define (add-interval x y) | |
(make-interval (+ (lower-bound x) (lower-bound y)) | |
(+ (upper-bound x) (upper-bound y)))) | |
(define (div-interval x y) | |
(mul-interval x | |
(make-interval (/ 1.0 (upper-bound y)) | |
(/ 1.0 (lower-bound y))))) | |
(define (mul-interval x y) | |
(let ((p1 (* (lower-bound x) (lower-bound | |
y))) | |
(p2 (* (lower-bound x) (upper-bound | |
y))) | |
(p3 (* (upper-bound x) (lower-bound | |
y))) | |
(p4 (* (upper-bound x) (upper-bound | |
y)))) | |
(make-interval (min p1 p2 p3 p4) | |
(max p1 p2 p3 p4)))) | |
(width (make-interval 4 5)) | |
(width (make-interval 1 2)) | |
(sub-interval (make-interval 4 5) (make-interval 1 2)) | |
(add-interval (make-interval 4 5) (make-interval 1 2)) | |
(mul-interval (make-interval 4 5) (make-interval 1 2)) | |
(div-interval (make-interval 4 5) (make-interval 1 2)) |
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