Am 24.03.2015 um 22:29 schrieb Aaron Meurer:
On Tue, Mar 24, 2015 at 4:36 AM, Joachim Durchholz <j...@durchholz.org> wrote:
Is Meijer heuristic? In that case, I think variation due to changed sort
order would be expected.
Yes, it uses a lot of pattern matching, which is heuristic in nature.
I have tracked down the difference to a flatten() call inside the Mul
constructor. After that, Meijer is getting its heuristics in a different
order.
(I have taken a cursory look at the other test failures, and ~75% seem
to be integration-heavy math such as quantum physics.)
Problem is that if we change Mul to not sort its arguments via flatten,
this is going to ripple all over SymPy. That's not a labyrinth I wish to
enter. (1)
The other approach would be to accept that some unit tests depend on
sort order in a superficial way, and to change the unit tests. (2)
Is there a third, better approach?
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