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Re: [igraph] Clusters question

From: Tamás Nepusz
Subject: Re: [igraph] Clusters question
Date: Fri, 6 Apr 2012 00:30:32 +0200

> print g.clusters("strong")
> <igraph.clustering.VertexClustering object at 0x8defc8c>
> Now, how do I acces the members of this object: eg, size of components, 
> count of components etc?

VertexClustering has a couple of methods that let you do that. First, you can 
use VertexClustering as a list, in which case you get the vertex IDs of the 
vertices in each component:

cl = g.clusters("strong")
cl[0]     # gives you the first component
cl[1]     # gives you the second component
len(cl)  # gives you the number of components

You can also iterate over it as if it were a list:

for component in cl:
    print component

It also has a "membership" property that returns a vector in which element i 
contains the index of the component in which vertex i participates:

print cl.membership

If you need the subgraph corresponding to a given connected component (and not 
just a list of vertex IDs), use the subgraph() method of the VertexClustering:

g2 = cl.subgraph(0)     # returns the first component as another Graph object

Finally, VertexClustering also has a method called sizes(), which returns the 
sizes of each component. For more information, type help(Clustering) and 

Hope this helps.


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