You probably meant: vectorDotProduct = zipWith ( * ) (and this doesn't even include the sum) map ( * ) has type Num a => [a] -> [a -> a] which is not really

You probably meant: vectorDotProduct = zipWith ( * ) (and this doesn't even include the sum) map ( * ) has type Num a => [a] -> [a -> a] which is not really what the dot product should be.