Sandro Tosi <sandro.t...@gmail.com> added the comment:
Taken from
http://www.slac.stanford.edu/comp/unix/package/rtems/doc/html/libm/libm.info.copysign.html
i'd suggest to extend
Return a float with the magnitude of x
to
Return a float with the magnitude (absolute value) of x
It could probably help people less math-savvy in understand what's going to
happen :)
Maybe also (only in rest doc) might be nice to describe what happens in case
the arguments are NaN, f.e.:
>>> import math
>>> x = float('nan')
>>> math.copysign(1., x)
1.0
>>> math.copysign(-1., x)
1.0
>>> math.copysign(x, -1)
nan
>>> math.copysign(x, x)
nan
umedoblock: would you like to expand the patch with these notes (unless someone
objects :)).
----------
nosy: +sandro.tosi
stage: needs patch -> patch review
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<http://bugs.python.org/issue12211>
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