[issue3366] Add gamma function, error functions and other C99 math.h functions to math module
report at bugs.python.org
Sat Jan 2 15:58:59 CET 2010
Mark Dickinson <dickinsm at gmail.com> added the comment:
> In Python, exp2(x) can be spelled 2.0**x. What would exp2(x) gain us?
Not much, I suspect. :)
I'd expect (but am mostly guessing) exp2(x) to have better accuracy than
pow(2.0, x) for some math libraries; I'd further guess that it's somewhat
more likely to give exact results for (small) integral x.
Similarly for log2: log2(n) should be a touch more accurate than
log(n)/log(2), and the time you're most likely to notice the difference is
when n is an exact power of 2.
But we've already got the 'bit_length' method for integers, which fills
some of the potential uses for log2. So unless there's a feeling that
these functions are needed, I'd rather leave them out.
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