On Fri, Oct 2, 2015 at 6:08 PM, Vincent Delecroix <20100.delecr...@gmail.com> wrote: > Everything is fine > > sage: graphs.GrayGraph().diameter() > 6 > sage: graphs.FosterGraph().diameter() > 8 > > If you define a graph with a variable called Gamma and then call a method of > *another* variable G then do not expect to get the answer to a property of > Gamma... >
How embarrassing! Thanks Vincent and sorry for wasting bandwidth. > Vincent > > > On 02/10/15 19:01, David Joyner wrote: >> >> Simllar problem with the Gray graph: >> >> sage: Gamma = graphs.GrayGraph() >> sage: G.diameter() >> 8 >> (it should be 6) >> >> G = graphs.LCFGraph(54, [-25,7,-7,13,-13,25], 9) >> sage: G.diameter() >> 6 >> seems to be the Gray graph >> >> On Fri, Oct 2, 2015 at 5:47 PM, David Joyner <wdjoy...@gmail.com> wrote: >>> >>> On Fri, Oct 2, 2015 at 5:44 PM, David Joyner <wdjoy...@gmail.com> wrote: >>>> >>>> Hi all: >>>> >>>> Several online sources (including a page on Royle's website) give the >>>> girth of the Foster graph to be 10, but Sage gives 6: >>>> >>>> sage: Gamma = graphs.FosterGraph() >>>> sage: G.girth() >>>> 6 >>>> >>>> Is there a bug in girth? >>>> >>>> - David >>> >>> >>> I might have found an answer to my own question: >>> >>> sage: G = graphs.LCFGraph(90, [17,-9,37,-37,9,-17], 15) >>> sage: G.is_vertex_transitive() >>> True >>> sage: G.is_hamiltonian() >>> True >>> sage: G.chromatic_number() >>> 2 >>> sage: G.is_bipartite() >>> True >>> sage: len(G.vertices()) >>> 90 >>> sage: len(G.edges()) >>> 135 >>> sage: G.girth() >>> 10 >>> >>> These suggest that G is the true Foster graph >> >> > > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-support+unsubscr...@googlegroups.com. > To post to this group, send email to sage-support@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-support. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
