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Re: [igraph] Python Interface to igraph

From: Tamas Nepusz
Subject: Re: [igraph] Python Interface to igraph
Date: Fri, 8 Feb 2008 23:08:56 +0100

Shouldn't g.clusters() return the membership of each node to a
cluster? Am I doing anything wrong? On my machine, g.clusters()
returns what looks like a memory address.
g.clusters() returns an object with class VertexClustering (see the documentation or type help(Graph.clusters)). When you simply try to print this object, Python reports its class and its memory address. What you probably wanted based on your previous R experiences is the membership vector that's stored in an instance variable called membership. E.g.:

g=Graph.Erdos_Renyi(100, 0.1)
print cl.membership

The VertexClustering class has the following features:

len(cl) returns the number of clusters (if cl is a VertexClustering object)
cl[0] returns the members of the first cluster
cl[1] returns the members of the second cluster
...and so on
cl.membership returns the membership vector that you got used to when using the R interface
cl.q returns the modularity of the given partition


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