On Fri, Mar 27, 2015 at 5:26 PM, Joachim Durchholz <[email protected]> wrote: > Am 24.03.2015 um 22:29 schrieb Aaron Meurer: >> >> On Tue, Mar 24, 2015 at 4:36 AM, Joachim Durchholz <[email protected]> >> 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 the result deterministic? And is it still mathematically correct? Aaron Meurer > > Is there a third, better approach? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/5515D91E.7040509%40durchholz.org. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6LZQGD7uGgeOn3yRuVNXuueD7_A__3Z3Xdz72fX077Nvw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
