[plt-scheme] Re: HTDP 14.3.4 lists within lists.

I got it, I wasn't thinking clearly about what happens to Rest when
it's pumped through the function so was over compensating. I'm pretty
happy with the way I've evaluated which of the two is the larger
branch, though it is unnerving to see the process performed twice on
the selected branch.

-- if all branches of a cond add 1 to something, you can move this
outside.

I'll keep my eye open for that one. On to 14.4  Extended Exercise:
Evaluating Scheme! Thanks for all the help.

On Apr 1, 3:44 am, Marek Kubica <ma... at xivilization.net> wrote:
> Hi,
>
> I implemented it for myself and guess what - I did the same error as
> you did, my solution often returned a bigger depth than there actually
> was.
>
> On Tue, 31 Mar 2009 10:03:01 -0400
>
> Matthias Felleisen <matth... at ccs.neu.edu> wrote:
> > To answer question 1, you need to come up with a test case for which
> > you expect one result and your function produces a different one.
> > (Indeed, you should also have an argument as to why your expected
> > result is the one you want.)
>
> I recommend testing this test case:
>
> (depth '((a) (b)))
>
> It should return 1 but on my first solution it returned 2. It is useful
> to start the debugger to step over it and find out why that happens.
>
> After realizing what the problem is, a fix is trivial.
>
> regards,
> Marek
> _________________________________________________
>   For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme

On Apr 1, 3:44 am, Marek Kubica <ma... at xivilization.net> wrote:
> Hi,
>
> I implemented it for myself and guess what - I did the same error as
> you did, my solution often returned a bigger depth than there actually
> was.
>
> On Tue, 31 Mar 2009 10:03:01 -0400
>
> Matthias Felleisen <matth... at ccs.neu.edu> wrote:
> > To answer question 1, you need to come up with a test case for which  
> > you expect one result and your function produces a different one.  
> > (Indeed, you should also have an argument as to why your expected  
> > result is the one you want.)
>
> I recommend testing this test case:
>
> (depth '((a) (b)))
>
> It should return 1 but on my first solution it returned 2. It is useful
> to start the debugger to step over it and find out why that happens.
>
> After realizing what the problem is, a fix is trivial.
>
> regards,
> Marek
> _________________________________________________
>   For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme