Jason Grout wrote:
> adrian wrote:
>> Now, there is another problem:
>>
>> Say, I want to define a multigraph with selfloops, and edge labels..
>> One way to do this is:
>>
>> import networkx
>> G=networkx.XDiGraph(selfloops=True,multiedges=True)
>> for i in range(3): G.add_node(i)
>> for i in [(1,1,'hola'),(1,1,'hi'),(1,2,'two'),(1,2,'dos'),
>> (2,1,'one')]: G.add_edge(i)
>> G=DiGraph(G)
>>
>> Now, I would be tempted to just do the following:
>> G=DiGraph({1:{1:'hola',1:'hi',2:'two',2:'dos'},2:{1:'one'}},
>> loops=True, multiedges=True)
>>
>> or trying
>>
>> import networkx
>> G=networkx.XDiGraph({1:{1:'hola',1:'hi',2:'two',2:'dos'},2:{1:'one'}},
>> selfloops=True, multiedges=True)
>>
>> But in each case I get:
>>
>> G.edges()
>>
>> (1, 1, 'h'), (1, 1, 'i'), (1, 2, 'd'), (1, 2, 'o'), (1, 2, 's'), (2,
>> 1,
>> 'o'), (2, 1, 'n'), (2, 1, 'e')]
>>
>>
>> Which is not as intended for two reasons: One is that the labels are
>> wrong, and the other one is that it created three edges from 1 to 2.
>>
>> Any help?
>
> It looks like it is creating an edge for every character in every other
> label, which I think is a bug. I've created a ticket to track the
> status of this bug: http://trac.sagemath.org/sage_trac/ticket/3928
>
> Thanks for reporting it.
As Robert Miller noted on the ticket, there is nothing wrong going on
here. The correct way to create the graph that you want is:
sage: G=DiGraph({1:{1:['hola','hi'], 2:['two','dos']},2:{1:['one']}},
loops=True, multiedges=True)
sage: G.edges()
[(1, 1, 'hi'), (1, 1, 'hola'), (1, 2, 'dos'), (1, 2, 'two'), (2, 1, 'one')]
Thanks,
Jason
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