[LCP]Base 2 logarithms

[Vincent Penquerc'h]

> This won't work for numbers less than zero (negative logarithms).

But a logarithm is undefined for negative numbers, isn't it ?

> Also, it only gives the integer part of the logarithm, which for
> my current needs doesn't really matter, but would be nice to know,
> nevertheless.

Oh. Right. I guess I've worked too much with ints only ;)
Then I guess you can approximate this using the Newton method
(as used for square root). Never tried it, but should work.

-- 
Vincent Penquerc'h 
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