Hi, Thanks for the patch, I'll have a look at the comparison functions when I have some time, surely next week. Where can I find the one defined by Sage ?
I have another question: are the source codes of GiNaC and pynac still "synchronized" in some way ? I saw that some recent changes are similar in both git repositories, but as I was going through the source code, I saw that numeric::do_print_csrc is defined in GiNaC but not in pynac. Regards, On 12 sep, 15:40, Burcin Erocal <bur...@erocal.org> wrote: > Hi Jean-Pierre, > > On Thu, 9 Sep 2010 02:13:27 -0700 (PDT) > > Jean-Pierre Flori <jpfl...@gmail.com> wrote: > > I created a Ticket on Sage's Trac: > >http://trac.sagemath.org/sage_trac/ticket/9880 > > > It could be a problem with the comparison function > > "expair_rest_is_less" used by "std::sort" function like in the > > following link: > >http://gcc.gnu.org/ml/gcc-bugs/2010-08/msg01163.html > > This is indeed the problem. Thanks for tracking it down. > > In the process of adapting GiNaC for use in Sage, I changed the > comparison functions to give a consistent order between different runs. > Apparently, the new comparison functions I wrote are not consistent. > > For a long time, I wanted to rip out these new functions, and use them > only for printing. The following patch is a first step towards this: > > http://sage.math.washington.edu/home/burcin/pynac/pynac_order.patch > > After applying this patch to pynac (see here [1] for instructions on > how to set up a pynac development environment), the segfault you > reported, and the bug at #9046 goes away. > > Note that this is very much a work in progress. I didn't take care to > make sure these comparison functions are consistent either. In the > process of copying things over, I even flipped a few signs in the > results. > > This needs much work to be finished, we need to make sure the order > is consistent and correct, and it matches the one currently used by > Sage. The issue of accessing the operands of a symbolic expression also > needs to be sorted out, but that's merely a user interface issue. > > I'd appreciate help with any of this, since I don't have much time to > spend on Sage/pynac these days. I'd be glad to answer any questions > though. > > Cheers, > Burcin -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
