Re: Slaying the HYPOTamus

On Mon, Aug 24, 2009 at 07:07:13AM -0700, David Fetter wrote:
> These next two lines are a teensy bit baroque.  Is there some
> significant speed increase that would justify them?

Just noticed with your revised code that the following check:

> On Mon, Aug 24, 2009 at 11:14:19PM +1000, Paul Matthews wrote:
> >     if (x == 0.0)
> >         return 0.0;
> >     else {
> >         yx = y/x;

is preventing a divide by zero on the line above.  So it's not a
performance hack, it's just allowing it to remain correct as a result of
changing the maths around.

> >         return x*sqrt(1.0+yx*yx);
> >     }
> > }

--  Sam  http://samason.me.uk/