Re: [igraph] add vertex and set its attribute

[Tamas Nepusz]

len(g.vs(type=0)) or len(g.vs.select(type=0)) is the way to go.

-- 
Tamas

On 01/18/2011 03:35 PM, Simone Gabbriellini wrote:
> thanks Tamas,
>
> it works perfectly! May I ask a last t one last thing, how can I find the 
> vcount() for each set? I am trying something like:
>
> len(g.vs("type"==0))
>
> but I'm afraid this is neither the right nor the smartest way... 
>
> best regards,
> Simone
>
> Il giorno 18/gen/2011, alle ore 14.12, Tamas Nepusz ha scritto:
>
>>> Is there a single line  code I can use for this or should I recover the 
>>> vertex by its id, which I suppose will be the larger in the graph?
>> THe ID of the newly added vertex should  be the largest in the graph,
>> so you can use that. Alternatively, you can create a helper method:
>>
>> def add_vertex_with_attrs(graph, attrs):
>>    n = graph.vcount()
>>    graph.add_vertices(1)
>>    for key, value in attrs.iteritems():
>>        graph.vs[n][key] = value
>>
>> Then you can simply call:
>>
>> add_vertex_with_attrs(graph, {"type": 0})
>>
>> -- 
>> Tamas
>>
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