[issue3366] Add gamma and error functions to math module

[Daniel Stutzbach]

Daniel Stutzbach <daniel at stutzbachenterprises.com> added the comment:

On Mon, Jul 21, 2008 at 5:34 PM, Raymond Hettinger
<report at bugs.python.org> wrote:
> There are several different approximations to choose from.  Each of
> them has their own implications for speed and accuracy.

FWIW, the current patch dynamically selects one of a few different
approximation methods based on the input value.

+1 on kicking it around and comparing the output with that from other
mathematics tools.

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