ERROR "U:\slav\FP\Avg.hs":11 - Type error in application *** Expression : accum list / length list *** Term : accum list *** Type : Float *** Does not match : Int
Why "accum list" should match to "Int"? When I try to replace (length list) with number - it works.
length :: [a] -> Int -- this is your problem use genericLength :: Num k => [a] -> k instead
================================ my_avg list = (accum list) / 5 --works fine ================================
This works because '5' is translated to 'fromInteger 5', which can be a Float as desired.
xx = 5 my_avg list = (accum list) / xx --doesn't work -- same message as above
This doesn't work because defaulting occurs and xx is given type Integer. -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume