suppose I have an attribute of a node, a label with the name of the
node, say "simone"
how can I retrive the index of the node with label == "simone"?
Every VertexSeq object has a .select() method that can be used to
select a subset of the VertexSeq. Since g.vs is the set of all
vertices in the graph, you can call .select() on g.vs as follows.
Suppose that your attribute is "name" and the value you are looking
for is "Simone". You can do the following:
g.vs.select(name="Simone") -- this returns a VertexSeq that contains
ALL the vertices where the "name" attribute is "Simone". (The result
is a VertexSeq and not a Vertex because theoretically there could be
more than one vertex with this name). If you know that there is only
one such vertex, you can type g.vs.select(name="Simone")[0] to get
this single Vertex or g.vs.select(name="Simone")[0].index to get the
index of this vertex.
Alternatively, you can get all the vertex names with g.vs["name"]
and look for "Simone" using the .index() method of list objects:
g.vs["name"].index("Simone") returns the index of the FIRST vertex
whose name is "Simone".
--
Tamas
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