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Re: [igraph] Community detection of weighted graphs and weighted modular

From: Gábor Csárdi
Subject: Re: [igraph] Community detection of weighted graphs and weighted modularity
Date: Mon, 23 Apr 2012 10:09:51 -0400

On Fri, Apr 20, 2012 at 9:13 AM, R N <address@hidden> wrote:
> After asking this question, I looked in teh codeZ of R interface of
> igraph-0.5.4 myself
> and got an impression that the CD methods: spinglass, walktrap,
> fast_greedy, label_propagation
> in fact do use the edge weights, if defined for the graph, by default,
> even though this parameter
> is not explicitly given in the function call.

>From the manual:

 weights: The weights of the edges. Either a numeric vector or ‘NULL’.
          If it is null and the input graph has a ‘weight’ edge
          attribute then that will be used. If ‘NULL’ and no such
          attribute is present then the edges will have equal weights.

So yes, if the graph has a 'weight' edge attribute, then that is used
in these algorithms.



Gabor Csardi <address@hidden>     MTA KFKI RMKI

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