Tim Peters <[email protected]> added the comment:
If someone opens a bug report with OpenBSD, or just for us to get more info, it
could be useful to have a larger universe of troublesome tan inputs to stare
at. So the attached tanny.py supplies them, testing all inputs within 100 ulps
of math.pi/2 (or change N=100 to whatever you like).
There are no failures on my 64-bit Win10 3.6.1.
The "correct" answers are computed by using mpmath.tan() set to 200 mantissa
bits, then rounding back to 53 bits. These all match the results from my
dirt-dumb decimal tan() rounded back, but it's better to trust a widely-used
package.
Of course mpmath needs to be installed ("pip install mpmath" works fine):
http://mpmath.org/
Nothing else is needed (while mpmath will exploit gmpy if it's installed, by
default it sticks to pure Python code).
----------
Added file: https://bugs.python.org/file47183/tanny.py
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