On Saturday, 1 October 2016 15:30:19 UTC+1, Vincent St-Amour wrote:
> On Sat, 01 Oct 2016 09:13:25 -0500,
> Angus wrote:
> > Then I changed smaller (and bigger) like this:
> >
> > (define (smaller w)
> > (interval (interval-small w)
> > (max (interval-small w)
> > (sub1 (guess w)))))
> >
> > to
> >
> > (define (smaller w)
> > (interval (interval-small w)
> > (max (interval-small w)
> > (sub1 (guess w))) ((+ interval-guesses 1) w)))
> >
> >
> >
> > But with these changes, when I run the program I get:
> >
> > +: contract violation
> > expected: number?
> > given: #<procedure:interval-guesses>
> > argument position: 1st
> > other arguments...:
> > 1
>
> What is `interval-guesses`? Your code would like it to be a number, but
> it's actually an *accessor*. If you pass it an interval, then you'll get
> the number you want.
>
> Jumping ahead a little: you may also want to double-check how you're
> constructing your intervals.
>
> Vincent
This seems to work:
(define (smaller w)
(interval (interval-small w)
(max (interval-small w)
(sub1 (guess w))) (+ (interval-guesses w) 1)))
But I don't understand why???
the first argument is passed as (interval w)
what does that mean? Does it mean that interval-small should be set to the
current interval-small???
So then what does
(+ (interval-guesses w) 1) mean?
set interval guesses to whatever the current state is (represented by w) plus 1?
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