True, I should've used numeric. I said in the article it was out of laziness.

I chose float originally because that's the type that the trigonometry functions use. Ideally I'd have it return the same type as is passed in (the way that the others work). But I knew numeric would be better... I was just being lazy.

As for using abs... yes - that would've been better. And I can't believe I didn't see that it doesn't work for 0. That's awful of me.

Thanks Hugo...

Rob