Writing a generic mean function in Scala

Question

I\'m trying to write a generic mean function that operates on an Iterable that contains numeric types. It would operate, say, on arrays, as so:

val rand = n         


        

Answer 1

One of your version is pretty close:

def mean[T](xs: Iterable[T])(implicit num: Numeric[T]):Double = 
  num.toDouble(xs.sum) / xs.size

Here is the other syntax:

def mean[T: Numeric](xs: Iterable[T]):Double =
  implicitly[Numeric[T]].toDouble(xs.sum) / xs.size