Import two space separated columns of integers from file. -----------
1 2
3 4
----------- , and it should convert to ([1,2],[3,4]) :: ([Integer], [Integer])
-- working on lines makes life easier mapFst f (x,y) = (map f x,y) getListLines ls = span (/="") $ dropWhile (=="") ls lineToInteger l = read l::Integer readIntegers = (mapFst lineToInteger).getListLines -- testing, 1..3 main = do cts <- readFile "data" let (first,rest) = readIntegers $ lines cts (second,_) = readIntegers $ rest print (first,second) Error checking (recommended!) and generalisation to more than two columns left as an exercise.. Hth, Claus -- Haskell Communities and Activities Report (May edition) All contributions are due in this week! http://www.haskell.org/communities/