Very near... Thanks, I would like the circle inside it
https://en.wikipedia.org/wiki/Fano_plane
Do you know why sage choose matroid to make this graphics ?
I just begin and my question might be nonsense.
Le 29/03/2018 à 16:48, David Joyner a écrit :
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
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