Some time ago I discovered that the monadic "sequence" function operates quite interestingly on lists. I don't know why you call it multiplication. I was looking for something like combinations: Prelude> sequence [[1,2,3], [4,5], [6,7]] HTH Christian Am 08.04.2014 07:00, schrieb Nishant:
hi,
I am trying to implement a set multiplication program in haskell.
Input : [1,2,3] [4,5] [6,7] Ouput : [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...]
I implemented it for constant number of inputs like
setMul xs ys zs = [ [x] ++ [y] ++ [z] | x <- xs , y<-ys ,z <- zs]
I am not able to generalize this for any number of lists.
type signature would be :
setMulMany :: [[a]] -> [[a]]
Example :
Input : [ [1,2,3] , [4,5] , [6,7]] Ouput : [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...]
Regards. Nishant
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