[Haskell-cafe] Combination-lock problem

[Thomas L. Bevan]

Just make the function recursive.
There is a simple relation between,

l [a,b,c] and l [b,c]

Tom

On Tue, 10 Aug 2004 14:01, Florian Boehl wrote:
> Hi,
>
> I'ld like to generate a list (of lists) that contains all combinations
> of natural numbers stored in another list. It should work like a
> combination-lock. E.g.:
>
> [2,2] -> [[0,0],[0,1],[0,2],[1,0],[1,1],[1,2],[2,0],[2,1],[2,2]]
>
> If I know the length 'l' of the 'locklist', I can solve the
> problem via generators. E.g.:
>
> l = 2: [[a,b] | a <- [0..locklist!!0], b <- [0..locklist!!1]]
>
> But if the length is unknown (because it's dynamic) this solutions (of
> course) fails. Is it possible to solve this problem in haskell in an
> elegant way?
>
> Thanks
>
> Flo
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