Haskell for Perl ProgrammersList and String Manipulation RoutinesMulti-map Function

4.2. Multi-map Function

orig = [1 .. 10]
one = [ i*2 | i <- orig ]
two = [ i*3+1 | i <- orig ]
three = orig
four = [ 100-i | i <- orig ]

lists = [one,two,three,four]

transpose_list ([]:as) = []
transpose_list as =
    [ head(i) | i <- as] :
        transpose_list ([ tail (i) | i <- as])

multimap func list_of_lists = (map func (transpose_list list_of_lists))

result = multimap sum lists


Written by Shlomi Fish