[sage-support] Re: sage disagrees with a paper about strong product of graphs
Hellooo !!! Don't know if this is a bug, but sage numerically disagrees with a paper about strong product of graphs. I would trust Sage in that case :-D I implemented |strong_product| and don't get the same products as sage (C_4 bound passed, the Kneser one didn't pass with my code). What is the drama? (Didn't audit sage's strong_product). Well, did you try Sage's strong_product method, or did you write your own ? Anyway, Sage can compute chromatic numbers in many different ways (see g.chromatic_number? ). I would say that if they all answer the same result then the problem lies in the product, otherwise it (obviously) lies in the coloring functions :-) Good luck ! Nathann -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en.
[sage-support] Re: sage disagrees with a paper about strong product of graphs
On Wed, Dec 05, 2012 at 10:45:28AM +0100, Nathann Cohen wrote: Hellooo !!! Don't know if this is a bug, but sage numerically disagrees with a paper about strong product of graphs. I would trust Sage in that case :-D I implemented |strong_product| and don't get the same products as sage (C_4 bound passed, the Kneser one didn't pass with my code). What is the drama? (Didn't audit sage's strong_product). Well, did you try Sage's strong_product method, or did you write your own ? The sage session i gave was on vanilla sage, didn't include results from my implementation. sage is contradicting at least one more paper on strong products FYI. Anyway, Sage can compute chromatic numbers in many different ways (see g.chromatic_number? ). I would say that if they all answer the same result then the problem lies in the product, otherwise it (obviously) lies in the coloring functions :-) Good luck ! Nathann -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en.
[sage-support] Re: sage disagrees with a paper about strong product of graphs
The sage session i gave was on vanilla sage, didn't include results from my implementation. Good. There's been a patch on this function very recently : http://trac.sagemath.org/sage_trac/ticket/13699 Is your version of Sage more recent than that ? If so, as it looks like there's still a bug, could you attempt to identify what exactly the bug is (and possibly write the patch too) ? :-P Have fn !!! Nathann -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en.
Re: [sage-support] Re: sage disagrees with a paper about strong product of graphs
On Wed, Dec 05, 2012 at 11:27:21AM +0100, Nathann Cohen wrote: The sage session i gave was on vanilla sage, didn't include results from my implementation. Good. There's been a patch on this function very recently : http://trac.sagemath.org/sage_trac/ticket/13699 Is your version of Sage more recent than that ? I am using sage 5.4 binary download so i suppose I don't have this patch. If so, as it looks like there's still a bug, could you attempt to identify what exactly the bug is (and possibly write the patch too) ? :-P Have fn !!! Nathann -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en. -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en.
Re: [sage-support] Re: sage disagrees with a paper about strong product of graphs
Hellooo !! I now have my own cherished computed in front of my hands : sage: C4=graphs.CycleGraph(4);K=graphs.CompleteGraph(3) sage: G=C4.strong_product(K) sage: G.chromatic_number() 6 sage: F=K.strong_product(C4) sage: F.chromatic_number() 6 God, I love those bugfixes The bugfixes which are already written :-P Nathann On 5 December 2012 11:58, Georgi Guninski gunin...@guninski.com wrote: On Wed, Dec 05, 2012 at 11:27:21AM +0100, Nathann Cohen wrote: The sage session i gave was on vanilla sage, didn't include results from my implementation. Good. There's been a patch on this function very recently : http://trac.sagemath.org/sage_trac/ticket/13699 Is your version of Sage more recent than that ? I am using sage 5.4 binary download so i suppose I don't have this patch. If so, as it looks like there's still a bug, could you attempt to identify what exactly the bug is (and possibly write the patch too) ? :-P Have fn !!! Nathann -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en. -- You received this message because you are subscribed to the Google Groups sage-support group. 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. Visit this group at http://groups.google.com/group/sage-support?hl=en.
