no sign() function ?

[Pierre-Alain Dorange]

I don't find any sign(x) function in the math library (return the sign
of the value).
I've read that math module is a wrapper to C math lib and that C math
lib has not sign(), so...

I've implement my own sign function of course (it's easy) but a standard
one in math would be better and could be faster.

How do you implement this or is there any other module with a sign()
function ?

-- 
Pierre-Alain Dorange        <http://microwar.sourceforge.net/>

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