I think Interval was just added for its own sake. Aaron Meurer
On Fri, Apr 11, 2014 at 11:26 AM, Matthew Rocklin <[email protected]> wrote: > All I know is that Interval and Union were there before I got here. Maybe > integrals? > > I've changed things in FiniteSet and had some core things break. > > But yes, Set is not Expr or Basic. > > > On Fri, Apr 11, 2014 at 9:09 AM, Aaron Meurer <[email protected]> wrote: >> >> I don't mean the core as in sympy.core. I mean the core as in the base >> classes Basic, Expr, Add, Mul (and to some extend the numbers). Stuff >> that *everything* uses. Not everything uses the sets. Unless I'm >> missing some very core use of the sets. >> >> Aaron Meurer >> >> On Fri, Apr 11, 2014 at 11:05 AM, Matthew Rocklin <[email protected]> >> wrote: >> > Well, sets is in the core. Interval, Union, and FiniteSet are all used >> > in >> > various parts. Fortunately though I think we refactor without changing >> > functionality. So far I've just replaced a custom double dispatch >> > system >> > with multipledispatch. >> > >> > >> > On Fri, Apr 11, 2014 at 8:46 AM, Aaron Meurer <[email protected]> >> > wrote: >> >> >> >> Oh, that's even better. Then we don't have to touch the core, and we >> >> can merge even experimental things faster. >> >> >> >> Aaron Meurer >> >> >> >> On Fri, Apr 11, 2014 at 10:40 AM, Matthew Rocklin <[email protected]> >> >> wrote: >> >> > Sets is a good play module for this purpose. Union and Intersection >> >> > simplify pairwise much like Add and Mul would. I like the pairwise >> >> > methods >> >> > we have but the strategy to orchestrate them could use some cleaning >> >> > up. >> >> > Might be a good place to build intuition. >> >> > >> >> > See https://github.com/sympy/sympy/pull/2979 >> >> > >> >> > >> >> > On Fri, Apr 11, 2014 at 8:27 AM, Aaron Meurer <[email protected]> >> >> > wrote: >> >> >> >> >> >> This has always been the original motivation for multiple dispatch, >> >> >> at >> >> >> least in my mind. You can't make objects that do their own thing in >> >> >> Add or Mul or whatever. There are a dozen example of this throughout >> >> >> SymPy, and a dozen more in user code. There are many hacky ways >> >> >> around >> >> >> it, but none are satisfactory. >> >> >> >> >> >> The problem is, how do you dispatch Add(*args). Any argument of the >> >> >> Add might want to do anything with any other argument. You don't >> >> >> want >> >> >> to require that arguments be next to each other, because then >> >> >> something as simple as Add(yourobject, 0, yourobject) wouldn't do >> >> >> the >> >> >> right thing. You can do the n**2 passes, but does it remain >> >> >> efficient >> >> >> at that point? >> >> >> >> >> >> I think we should just start to play with this, especially now that >> >> >> we >> >> >> have a decent implementation of multiple dispatch. I'd personally >> >> >> rather play with this with a module that I can understand (so, e.g., >> >> >> matrix expressions rather than tensores), but anything is better >> >> >> than >> >> >> nothing. >> >> >> >> >> >> Aaron Meurer >> >> >> >> >> >> On Fri, Apr 11, 2014 at 5:17 AM, F. B. <[email protected]> >> >> >> wrote: >> >> >> > >> >> >> > >> >> >> > On Friday, April 11, 2014 1:29:11 AM UTC+2, Aaron Meurer wrote: >> >> >> >> >> >> >> >> There are probably little ways around these things, but nothing >> >> >> >> clean >> >> >> >> without dispatching in the core. >> >> >> > >> >> >> > >> >> >> > Another point in favor of multiple dispatching. >> >> >> > >> >> >> > By the way, tensor expressions should just become ordinary >> >> >> > expression >> >> >> > with >> >> >> > the addition of an index management mechanism, as well as other >> >> >> > features >> >> >> > such as components data association. >> >> >> > >> >> >> > Of course some precautions should be taken, for example all >> >> >> > indices >> >> >> > have >> >> >> > to >> >> >> > be contracted if you take the exponential of a tensor expression >> >> >> > (I >> >> >> > am >> >> >> > wondering, did anyone ever define a unique and consistent way to >> >> >> > generalize >> >> >> > the matrix exponential to tensors of any rank?). >> >> >> > >> >> >> > -- >> >> >> > 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/b7592a77-00ef-4c82-a94b-f0e904581c63%40googlegroups.com. >> >> >> > >> >> >> > 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 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https://groups.google.com/d/msgid/sympy/CAJ8oX-Fh-a3sJ9NFRG%3DNt1bxcbkqcTLzcOPTMjGU4Hy%2BxEmdAg%40mail.gmail.com. >> >> > >> >> > 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%3D6%2BOOW5iHNsOCbFW26A6zh7j%3DnCm57pNTu8hTCv8m81i5Q%40mail.gmail.com. >> >> >> >> 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/CAJ8oX-FgYuCqRHmwEPL%2Bt-5YPTmB8XPwzcZevOpUNgAAcUFp7g%40mail.gmail.com. >> > >> > 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%3D6KynwwTuTnPtEzKL45vgUg5Q00zdxXc-jSQb9K_L8LtNA%40mail.gmail.com. >> >> 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/CAJ8oX-Hrb-Uq0T5fqauTDJyva0eQzMg4vhHyM29xf%2B%3D_FiK%2BEw%40mail.gmail.com. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. 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