That is perfect! Thanks a lot!


On 24 May 2014 12:20, Tiago de Paula Peixoto <tiago@skewed.de> wrote:
On 05/24/2014 05:42 PM, Flavien Lambert wrote:
> Hi, I am sorry, I think there is no difficulty. It is just that I did not get how to get the id once you have the node index :
>
> from graph_tool.all import *
> g=load_graph('nodeNetwork.graphml')
> l=label_largest_component(g)
> u=list(l.a)
>
> So from u, I get the indices (for the 0 entries). I would like to know what are the id's of the graph_tool vertices in my original nodeNetwork.graphml.

That depends on what you mean by "id". Each vertex in the graph has an
associated index, which is retrieved via the vertex_index attribute of
the graph:

    idx = g.vertex_index[v]

or equivalently

    idx = int(v)

However, if you are referring to some property map stored in your
graphml file which you call "id", then this resides inside the internal
property maps of the graph:

    id_map = g.vp["id"]
    id = id_map[v]

And finally, if you want the intrinsic ids inside the graphml file if
they are not in canonical form, this can be retrieved via:

    id_map = g.vp["_graphml_vertex_id"]
    id = id_map[v]

Best,
Tiago

--
Tiago de Paula Peixoto <tiago@skewed.de>


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