On Thu, Mar 29, 2018 at 9:32 AM, Henri Girard <henri.gir...@gmail.com> wrote: > Hi, > > I don' manage matroid well, is there no way for doing a fano's graph with a > matrix ? > > After I could find adjacent and incident matrix apparently in matroid is not > possible ?
The fano matroid is not graphical https://en.wikipedia.org/wiki/Graphic_matroid#Minors_and_duality so it doesn't have an adjacency matrix in the sense of a graph. Here is a graph whose picture looks a bit like the standard image of the Fano matriod: sage: Gamma = Graph([(0,1),(0,2),(1,2),(1,3),(3,4),(1,4),(2,4),(2,5),(4,5)]) sage: A = Gamma.adjacency_matrix() sage: A [0 1 1 0 0 0] [1 0 1 1 1 0] [1 1 0 0 1 1] [0 1 0 0 1 0] [0 1 1 1 0 1] [0 0 1 0 1 0] I'm not sure if that is what you are looking for. > > Any help welcome > > Henri > > -- > 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 https://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 https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
