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Edge color for undirected multiedge graphs

asked 2017-10-13 09:00:23 -0600

Acksl gravatar image

It seems that there is a bug with specifying the color of undirected multiedges. Here's an example:

G=graphs.PathGraph(2)
G.allow_multiple_edges(True)
G.add_edge((0,1))
G.plot(edge_colors={"red":[(1,0)]})

The graph plotted has then four edges, two black and two red. It seems that the multiedge to be colored red is seen as a different one than the already present one, even though they are actually the same since the graph is undirected. I get the intended plot if I change the last line to:

G.plot(edge_colors={"red":[(0,1)]})
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Thank you for spotting this bug and reporting it. Thanks to David Coudert, this should be fixed in Sage 8.1 when it comes out.

slelievre gravatar imageslelievre ( 2017-10-15 14:11:27 -0600 )edit

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answered 2017-10-15 09:07:22 -0600

This is now ticket #24051

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Thank you for opening the ticket and providing a fix!

slelievre gravatar imageslelievre ( 2017-10-15 14:10:23 -0600 )edit

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Asked: 2017-10-13 09:00:23 -0600

Seen: 83 times

Last updated: Oct 13