Mark Dickinson added the comment:
The problem with atanh is that it should be using absx throughout, rather than
x.
So in "if (absx < 0.5)" branch and the following branch, replace all
occurrences of x with
absx, and it should work.
One other comment: asinh shouldn't directly set errno for a NaN. It should do
the same as
acosh and atanh: return x+x.
This makes asinh(float("nan")) return a nan, which makes it consistent with
acosh and
atanh, consistent with the way that Linux and OS X behave, and consistent with
the other
single-argument functions in math.
I think asinh should also return x+x for x an infinity. This again should make
it
consistent with the way that the libm asinh works on OS X and Linux.
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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue1640>
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