davidp wrote:
> Hi,
>
> I was a bit surprised by the difference exhibited below:
>
> sage: G = DiGraph({1:{2: 2}, 2:{1:1}})
> sage: G.show()
I'm surprised by the output of this. There are clearly two edges in the
graph: 1->2 and 2->1, but only one edge is shown.
> sage: DiGraph(G.laplacian_matrix()).show()
>
The Laplacian matrix has nonzero entries indicating edges from each
vertex to each other vertex, so why do you find it surprising that there
are two edges?
sage: H=DiGraph(G.laplacian_matrix())
sage: H.edges()
[(0, 0, 1), (0, 1, -1), (1, 0, -1), (1, 1, 1)]
I find it surprising that arrowheads don't appear in the following, though:
sage: DiGraph(G.laplacian_matrix()).show()
Thanks,
Jason
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