[Numpy-discussion] Error in tanh for large complex argument

Pauli Virtanen pav at iki.fi
Fri Jan 28 07:07:06 EST 2011

Fri, 28 Jan 2011 12:57:18 +0100, Mark Bakker wrote:
> Follow up:
> The behavior is correct for real argument:
> So maybe we should look there for good logic,

In the real case you can do "if (abs(z) > cutoff) return sgn(z)",
which is not the right thing to do for complex numbers.

Anyway, Python's cmath functions correctly, so I'm first going
to look there, and then at the glibc/gfortran implementation.


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