You are correct in this, Shannon, and you have nicely explained all of
the otherwise confusing clues about thunks.
I shall revisit these problems from the point of view of view of the
course.
The section of Dan Grossman's video lectures that deal with Racket are
an excellent introduction to the
Patrick,
> I saw that. The requirement for a stream of alternating values was
> clearly stated, but then it confusingly talked about the internal
> structure of a stream. Surely if the stream is constructed by
> stream primitives then it will all be thunked. Or do you read the
> problem as requi
domingo, 19 de mayo de 2013 21:20
> To: users@racket-lang.org
> Subject: Re: [racket] Problem Stream with alternating values
>
> On 19/05/2013 21:22, Jos Koot wrote:
> > Your function H1 is not lazy enough.
> >
> > Closely following the instructions of the exercise
t;
> Jos
>
>> -Original Message-
>> From: users-boun...@racket-lang.org
>> [mailto:users-boun...@racket-lang.org] On Behalf Of Patrick Sweetman
>> Sent: jueves, 16 de mayo de 2013 14:31
>> To: users@racket-lang.org
>> Subject: [racket] Problem Stream w
so ... the H1 recursion is evaluating it's arguments, producing a list
instead of a stream?
I based this on the ones function with the H1 helper function to act as
a toggle.
However, closer adherence to the 'ones' example and consing both values
at the same time works just fine, and is much more
jueves, 16 de mayo de 2013 14:31
> To: users@racket-lang.org
> Subject: [racket] Problem Stream with alternating values
>
> I'm doing this problem:
>
> 6. Write a stream dan-then-dog, where the elements of the stream
> alternate between the strings "dan.jpg" and
If you were to replace stream-cons with this function:
(define (not-stream-cons x y) (printf "x ~s y ~s\n" x y) 'something-random)
would it make sense to you what happens?
Robby
On Thu, May 16, 2013 at 7:30 AM, Patrick Sweetman wrote:
> I'm doing this problem:
>
> 6. Write a stream dan-then-d
I'm doing this problem:
6. Write a stream dan-then-dog, where the elements of the stream
alternate between the strings "dan.jpg" and "dog.jpg" (starting with
"dan.jpg"). More specically, dan-then-dog should be a thunk that when
called produces a pair of "dan.jpg" and a thunk that when called
produ
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