> Can anyone explain why the number of nodes is 425957 instead 317080?
It is probably because you read it into igraph using the "edgelist" format,
which assumes that vertex IDs start from zero and are continuous. If this is
not the case, use the "ncol" format, which will simply assign integer IDs to
the vertices and preserve the original IDs in the file in the "name" vertex
attribute (see my_graph.vs["name"]). Also, you will need to get rid of the
first four lines in the file and specify explicitly that your graph is
undirected:
In [1]: g=load("com-dblp.ungraph.txt", format="ncol", directed=False)
In [2]: summary(g)
IGRAPH UN-- 317080 1049866 --
+ attr: name (v)
--
T.
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