Daniel Fischer
myAvg' :: Int -> [Int] -> [ Double ] -> Double
myAvg' sum count [] = sum / fromIntegral count myAvg' sum count (x:xs) = myAvg' (x + sum) (n + 1) xs
ehask.hs:2:24: Couldn't match expected type `Double' against inferred type `Int' In the expression: s / fromIntegral count In the definition of `myAvg'': myAvg' s count [] = s / fromIntegral count Failed, modules loaded: none.
Yup, the type signature is wrong, it should be
myAvg' :: Double -> Int -> [Double] -> Double
Can you explain the error message in detail? To me it looks like this should be the problem: Prelude> fromIntegral [1, 2, 3] <interactive>:1:0: No instance for (Integral [t]) arising from a use of `fromIntegral' at <interactive>:1:0-21 Possible fix: add an instance declaration for (Integral [t]) In the expression: fromIntegral [1, 2, 3] In the definition of `it': it = fromIntegral [1, 2, 3]