You don't really need the Data.Char imported.

I really do need to work on my knowledge of the prelude functions. I tend to not rely enough on them.

hi,wickedswami215!What is the error of the output?If you get the array length error?Please make an array of empty judgement and need a return value,for example:return [];If it is the other error,please list the error message.

Thanks suic for the quick fix.

Thanks! It's fixed now. Regards, suic

the haskell function type seems wrong!
It's Maybe [Double] -> Double, I think the result type should be [Double]

The length of the input data can be less then 5.