The square function is also defined in earlier SICP sections so I would recommend you maintain a running file of all functions SICP defines so you can refer back to them easily.
> On Nov 26, 2014, at 5:37 AM, Catonano <caton...@gmail.com> wrote: > > Hello > > I understand that this is not the first time someone asks about using Racket > for a SICP study group. > > I used the not so mantained mit-scheme compatibility package and I tried to > paste this piece of code > > > > (define (average x y) > (/ (+ x y) 2)) > > (define (sqrt x) > (define (improve guess) > (average guess (/ x guess ))) > (define (good-enough? guess) > (< (abs (- (square guess) x )) .001)) > (define (try guess) > > (if (good-enough? guess) > guess > (try (improve guess)))) > (try 1)) > > > It should be the Newton's method to calculate the square root > > We copied it from the lectures > > In this code we use the "square" function. In mit-scheme it's ok, in Racket > it's not defined > > Should I import any module ? > > Are common functions named as in mit-scheme ? Or are we gonna run into > compatibility issues ? > > Thanks for any hint > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
