[sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-02 Thread Dima Pasechnik
On Oct 2, 6:07 pm, Nathann Cohen wrote: > >> Hi Nathann, > >> does your code provide for returning infeasibility certificates? > >> in case of CPLEX Python interface, it's here: > >> .solution.advanced.dual_farkas() > > Oh, you mean certificates of infeasibility for the LP itself ! Then it > sho

Re: [sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-02 Thread Nathann Cohen
>> Hi Nathann, >> does your code provide for returning infeasibility certificates? >> in case of CPLEX Python interface, it's here: >> .solution.advanced.dual_farkas() Oh, you mean certificates of infeasibility for the LP itself ! Then it shouldn't be so hard :-) How would you like to get it ? An

Re: [sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-02 Thread Nathann Cohen
Helloo > Hi Nathann, > does your code provide for returning infeasibility certificates? > in case of CPLEX Python interface, it's here: > .solution.advanced.dual_farkas() Certificates ? No, it raises exceptions for the moment, which can give you some idea of why it failed dep

[sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-01 Thread Dima Pasechnik
Hi Nathann, does your code provide for returning infeasibility certificates? in case of CPLEX Python interface, it's here: .solution.advanced.dual_farkas() This is something I need for our research on quantum codes; I have an industrial amount of smallish LPs, most of them infeasible, and have to u

[sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-01 Thread Nathann Cohen
3am... Dead, but done again :-D Nathann -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www

[sage-devel] Re: Rewrite of LP solver interfaces, constraint generations, and..... reviews :-)

2010-10-01 Thread Nathann Cohen
I. just noticed I had forgotten to type "hg add coin_backend* cplex_backend*" And I of course deleted all the files in the meantime to compile alpha2, thinking they were in the patch. I'm in for another try. Nathann -- To post to this group, send an email to sage-devel@g