Excerpts from Maur Toter's message of Sat Apr 03 09:54:26 -0400 2010: > I am new with Haskell so I think this will be a pretty dumb question. > I would like to make a function that makes this: > > listbool :: [[Int]] -> [[Bool]] > > in this way: > listbool [[1,2],[3,4]] == [[True, True],[False, False]] > listbool [[1],[5,5],[5,4],[2]] == [[True],[False, False],[True, True], > [False]] > > So always True from the elements of the first list, False from the elements > of the second one, etc...
Sure you can do this. In fact, the type can be more general: listbool :: [[a]] -> [[Bool]] listbool xs = zipWith ($) (map (\x -> map (const x)) (cycle [True, False])) xs Cheers, Edward _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
