[plt-scheme] Re: typo error 11.2.2

 From: Matthias Felleisen (matthias at ccs.neu.edu) Date: Sat Mar 28 17:17:16 EDT 2009 Previous message: [plt-scheme] Re: typo error 11.2.2 Next message: [plt-scheme] Internal definitions error. - Beginner. Messages sorted by: [date] [thread] [subject] [author]

```A teacher should be equally happy with both solutions if you
demonstrate systematic design.

Someone working through these exercises on his own should be
satisfied too with this level of understanding (above the average
college freshman).

-- Matthias

On Mar 28, 2009, at 4:06 PM, mike wrote:

> when one arrives at n = 0 during the recursive process
> (cond
>    ((zero? n) (cons (make-posn 0 (f 0)) empty)
>    (else (cons (make-posn n (f n) (tabulate-f (sub1 n))))
>  in this scenario we have n+1 posn structures in the list. I guesss
> this problem can be equally interpreted
> in 2 ways: firstly tabulate returns empty  when n=0 or
> one can also infer the above from the problem statement.
> mike
>
> On Mar 28, 10:23 am, Matthias Felleisen <matth... at ccs.neu.edu> wrote:
>> Is this true if f returns empty for 0?
>>
>> On Mar 28, 2009, at 12:39 AM, mike wrote:
>>
>>> Develop the function......Specifically it consumes
>>> a natural number and produces a list of  n posns.
>>> (since  0 is included in the recursion i believe it
>>> should state "a list of n+1 posns"
>>> mike
>>> _________________________________________________