Ah, so it seems that these incorrect limit heuristics have still not been completely abolished from the code base. I would recommend just using gruntz() for now. limit() is not that much smarter, but it does have a bad tendency to give wrong answers when gruntz() works just fine.
Aaron Meurer On Mon, Feb 17, 2014 at 1:29 PM, Christophe Bal <[email protected]> wrote: > Thanks for this. > > > 2014-02-17 19:21 GMT+01:00 Avichal Dayal <[email protected]>: > >> However gruntz gives the correct result:- >> gruntz((x*exp(x)) / (exp(x)-1), x, -oo) gives 0 >> >> The part of code that is going wrong is already labeled as XXX: todo >> More specifically the following:- >> if abs(z0) is S.Infinity: >> # XXX todo: this should probably be stated in the >> # negative -- i.e. to exclude expressions that should >> # not be handled this way but I'm not sure what that >> # condition is; when ok is True it means that the leading >> # term approach is going to succeed (hopefully) >> >> It should exclude some expressions and I guess this is one of them. >> I'll try to understand and fix it. >> >> >> -- >> 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. >> For more options, visit https://groups.google.com/groups/opt_out. > > > -- > 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. > For more options, visit https://groups.google.com/groups/opt_out. -- 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. For more options, visit https://groups.google.com/groups/opt_out.
