Should hypot be used for the radial coordinate?

[SebastianM-C]

I see that the radial coordinate is computed using sqrt(x[1]*x[1] + x[2]*x[2]). This could potentially overflow in some cases. Do you think the use of hypot(x[1],x[2]) would be better? The drawback would be that the code is more complex and thus could be a bit slower.

If you agree with the use of hypot, I can make a PR.

[andyferris]

Yes I think that is a good idea.