On 2005-10-25 at 13:42+0200 "Charles SDudu" wrote: > > okay, it took me some time to make your solution work, but it's as fast as > the precedent solution, and really more elegant. Thank you, but I dont know > how to structure the function, see yourself : > > calc str = filter (\p -> snd p > 0) $ assocs $ ((accumArray (+) 0 (toEnum 0, > toEnum 255) (map (\x->(x,1)) str)) :: UArray Char Int) > > It's not so nice but it works, isn't there a solution to put the type > elsewhere, and another type than UArray ?
Well, you can do this: import Array calc::String->[(Char, Int)] calc = filter (\p-> snd p > 0) . assocs . accumArray (+) 0 (minBound, maxBound) . (map (\x->(x,1))) You can import whatever sort of array you want, so long as it has assocs and accumArray. You don't want to change minBound and maxBound to toEnum x, since they are the bounds of Char, which might or might not be 0 and 255. Jón -- Jón Fairbairn Jon.Fairbairn at cl.cam.ac.uk _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe