[Haskell-cafe] Re: howto tuple fold to do n-ary cross product?

[Andrea Vezzosi]

On Mon, Nov 24, 2008 at 7:40 AM, Andrea Vezzosi <sanzhiyan at gmail.com> wrote:

> It's more natural to consider the cross product of no sets to be [[]] so
> your crossr becomes:
>
> crossr [] = [[]]
> crossr (x:xs) = concat (map (\h ->map (\t -> h:t) (crossr tail)) hd


Ops, hd and tail should be x and xs here.
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