Comment #6 on issue 3540 by [email protected]: not Float('inf') is True
http://code.google.com/p/sympy/issues/detail?id=3540
I see the following:
def mpf_norm(mpf, prec):
"""Return the mpf tuple normalized appropriately for the indicated
precision.
This also contains a portion of code to not return zero if
the mantissa is 0 since it is zero for mpf's +inf, -inf and
nan, too.
"""
sign, man, expt, bc = mpf
if not man:
# hack for mpf_normalize which does not do this;
# it assumes that if man is zero the result is 0
if not bc:
return FZERO
else:
# don't change anything; this should already
# be a well formed mpf tuple
return mpf
So my guess is that whatever is doing the test is looking at a zero in the
mantissa and is making the conclusion from that. Anyone want to sleuth that
out?
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