Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3315 by unlimite...@gmail.com: In meijerint_definite, the result
depends on the order of points in innermost
http://code.google.com/p/sympy/issues/detail?id=3315
The problem occurs around sympy/integrals/meijerint.py:1631, in
meijerint_definite. Depending on how the elements appear in innermost, the
result of integration may be either very simple or very complex, but
simplifiable to the simple result.
For an example refer to the sympy/integrals/tests/test_meijerint.py:322, in
test_probability:
integrate(x*normal(x, mu1, sigma1), (x, -oo, oo), meijerg=True)
For this integral, innermost includes mu1 and 0, and, depending on whether
meijerint_definite gets to 0 first or not, the result of the integral is
either mu1 or a very complex expression which simplify()'s to mu1.
This is currently worked around by sorting innermost with default_sort_key
in reverse order. I have no particular explanation why it is the reverse
order that works better.
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