hypot.RdSquare root of sum of squares
hypot(x, y)Element-by-element computation of the square root of the sum of squares
of vectors resp. matrices x and y.
Returns a vector or matrix of the same size.
Returns c() if x or y is empty and the other one has
length 1. If one input is scalar, the other a vector, the scalar will be
extended to a vector of appropriate length. In all other cases, x
and y have to be of the same size.