Status: Accepted
Owner: smi...@gmail.com
Labels: Type-Defect Priority-Medium NeedsReview smichr
New issue 2208 by smi...@gmail.com: gamma used int instead of floor
http://code.google.com/p/sympy/issues/detail?id=2208
Here is a case that was not detected when redefining int as int and not
floor: the gamma function's expand(func=True). Here is the comment from a
commit on fuzzy_and [ https://github.com/sympy/sympy/pull/122 ]
When the argument of gamma had an Add with a negative Rational
coefficient, int was being used on that coefficient rather than
floor. Now the expanded and unexpanded give the same value:
>>> gamma(-3*S.Half+x).subs(x,3).n() , \
... gamma(-3*S.Half+x).expand(func=True).subs(x,3).n()
(0.886226925452758, 0.886226925452758)
A symbolic test was added.
It was re-written, too, to use the more efficient as_coeff_add().
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