Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
OK I'll take a look :) On 15 May 2012 21:55, Nathann Cohen wrote: > Hell Emil !! > >> Any chance you could make a patch? :) (I'd volunteer myself, but I >> would probably mess it up!) > > H I could, but this patch is so local that it really is an > ideal occasion to write your first patch... Are you sure you do not > want to give it a try ? It is fun to be a developper, you will feel > like Sage becomes your home directory, and everybody will throw rocks > at you you create new bugs.. And all all the while you will be > having fun :-D > > Nathann > > -- > 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 -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
Hell Emil !! > Any chance you could make a patch? :) (I'd volunteer myself, but I > would probably mess it up!) H I could, but this patch is so local that it really is an ideal occasion to write your first patch... Are you sure you do not want to give it a try ? It is fun to be a developper, you will feel like Sage becomes your home directory, and everybody will throw rocks at you you create new bugs.. And all all the while you will be having fun :-D Nathann -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
On 15 May 2012 15:21, Nathann Cohen wrote: > Oh, it's usually quite straightforward to implement such things. > Usually the feature already exists in the solver's C api, and all the > work that needs to be done is to expose it in Sage :-) Any chance you could make a patch? :) (I'd volunteer myself, but I would probably mess it up!) Emil -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
Hellooo !! > Next issue is that the Gurobi backend doesn't support the copy: Oops ^^; > Any idea how much work this would be to do? Oh, it's usually quite straightforward to implement such things. Usually the feature already exists in the solver's C api, and all the work that needs to be done is to expose it in Sage :-) Nathann -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
Next issue is that the Gurobi backend doesn't support the copy: AttributeError: 'sage.numerical.backends.gurobi_backend.GurobiBacke' object has no attribute 'copy' Any idea how much work this would be to do? (I can now do what I wanted to do before, at least with GLPK.) Emil -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
On 15 May 2012 13:38, john_perry_usm wrote: >I've found MILP lets you do it this way: > > sage: x, y = lp[0], lp[1] Ahh! Thanks, this is what I need. (Is this documented anywhere?) - Emil -- 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
Re: [sage-support] Re: Making a copy of a MixedIntegerLinearProgram
Hi Nathann, Thanks for writing the MILP class - it works very well. Now, I can do: x = lp.new_variable() Is there any way to do something like x = lp.get_existing_variables() ? I'm working on some graph theoretic stuff: I'm solving two LPs for each graph, for as many graphs as I can. - Emil. On 15 May 2012 08:00, Nathann Cohen wrote: > By the way, could I ask you what lead you to create and solve many LP ? I > mean, what are you solving which requires you to do that ? ^^; > > Nathann > > -- > 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 -- 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
