How to write a code for obtaining a bipartite graph where the edges are indexed by some numbers?e.g if i write the code as D = DiGraph({ 0: [1,2,3], 1: [0,2], 2: [3], 3: [4], 4: [0,5], 5: [1] }) then only graph is coming but the edges are not indexed here.How should i modify this so that edges of the graph will be indexed?
Instead of a dictionary, do a dictionary of dictionaries specifying the labels of the edges. In your example:
sage: D = DiGraph({ 0: {1:123 , 2:234 , 3:12}, 1: {0:'a string', 2:42}, 2: {3:0}, 3: {4:34}, 4: {0:40, 5:11}, 5: {1:123} })
Note that you can label edges by strings as well if you want.
When plotting, if you want to see the labels, you should do:
sage: D.plot(edge_labels=True)
but in your code the labels are merged on the edges.can i do so that labels will show above the edges without merging on them?
yeah because it is difficult to read the labels from the edges.so is there any code so that labels will be clear?
It's not completely clear to me what you mean by "indexing" a graph edge. If you want to give them labels, you can do that using set_edge_label:
sage: D = DiGraph({ 0: [1,2,3], 1: [0,2], 2: [3], 3: [4], 4: [0,5], 5: [1] })
sage: D.edges()
[(0, 1, None),
(0, 2, None),
(0, 3, None),
(1, 0, None),
(1, 2, None),
(2, 3, None),
(3, 4, None),
(4, 0, None),
(4, 5, None),
(5, 1, None)]
sage: for i, (u, v, l) in enumerate(D.edges()):
....: D.set_edge_label(u, v, "edge # {}".format(i))
....:
sage: D.edges()
[(0, 1, 'edge # 0'),
(0, 2, 'edge # 1'),
(0, 3, 'edge # 2'),
(1, 0, 'edge # 3'),
(1, 2, 'edge # 4'),
(2, 3, 'edge # 5'),
(3, 4, 'edge # 6'),
(4, 0, 'edge # 7'),
(4, 5, 'edge # 8'),
(5, 1, 'edge # 9')]
sage: D.show(edge_labels=True)
produces
Asked: 2013-03-28 13:32:13 +0200
Seen: 432 times
Last updated: Mar 28 '13
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.