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My solutions to Structure and Interpretation of Computer Programs
hi @qiao ,
Inspired by your work I was trying to solve exercises in SICP & found a small issue in the solution of 2.09.scm.
sicp-solutions/chapter2/2.09.scm
Line 12 in a2fe069
FIX: if y is an interval [c d], (- y) will be an interval [-d, -c] (upper & lower bounds will flip when sign is changed). This will result in the width of (sub-interval x y) as (w1 + w2).
https://github.com/vthukral94/sicp/blob/main/chapter-2/2.8.scm#L21
; 1
; 1 1
; 1 2 1
; 1 3 3 1
; 1 4 6 4 1
;
; / 1 , c = 1 or r = c
; f(r, c) = <
; \ f(r - 1, c - 1) + f(r - 1, c) , otherwise
(define (pascal-triangle r c)
(if (or (= c 1) (= c r))
1
(+ (pascal-triangle (- r 1) (- c 1))
(pascal-triangle (- r 1) c))))
(pascal-triangle 3 4)
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