On Sun, May 15, 2011 at 6:54 PM, Brian Granger <elliso...@gmail.com> wrote: > On Sat, May 14, 2011 at 1:49 PM, Vinzent Steinberg > <vinzent.steinb...@googlemail.com> wrote: >> On 14 Mai, 18:31, Ronan Lamy <ronan.l...@gmail.com> wrote: >>> _op_priority was designed to help with implementing arithmetic >>> operations, particularly for things that aren't "calculus expressions" >>> yet have meaningful __add__, __mul__, __pow__, etc. such as vectors and >>> operators of various kinds. But it turns out that it doesn't really help >>> (http://groups.google.com/group/sympy/browse_thread/thread/810e127bc41...) >>> and it isn't used anywhere currently. >>> >>> It also has fundamental flaws that prevent it from ever evolving into a >>> complete solution to the problem: it assumes that the priority order is >>> the same for all operations and turns this order into a total order, >>> introducing couplings between objects that would otherwise have no >>> knowledge of each other. >>> >>> So, I think that there's little benefit in including into 0.7.0, but it >>> would have the significant drawback of committing us to support this >>> feature for who knows how long, and therefore of making much more >>> difficult to refactor this critical mechanism. And if _op_priority does >>> turn out to be useful, it can easily be added back in after the release >>> by reverting the removal. >> >> If it is not used, I think we can remove it. > > +1 >
Please don't do this. I use op_priority all the time. Its the one reason I haven't release my code because I depend on this functionality. In fact I was just about to mail the list about getting rid of all the hard coded Mul and Add in the core. -- Andy >> Vinzent >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To post to this group, send email to sympy@googlegroups.com. >> To unsubscribe from this group, send email to >> sympy+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/sympy?hl=en. >> >> > > > > -- > Brian E. Granger > Cal Poly State University, San Luis Obispo > bgran...@calpoly.edu and elliso...@gmail.com > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to sympy@googlegroups.com. > To unsubscribe from this group, send email to > sympy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
