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Re: [igraph] bipartite.projection and weighted graphs

From: Tamás Nepusz
Subject: Re: [igraph] bipartite.projection and weighted graphs
Date: Thu, 23 Jun 2011 19:07:10 +0200

Hi Guy,

igraph 0.5.x does not support weighted projections yet (as far as I know), but igraph 0.6 will support it, so you can try installing the development version and use that if you don't mind a few changes here and there in the library (the most important being that igraph 0.6 will use 1-based indexing instead of 0-based indexing). Let me know if you need instructions about how to get the development version.


On Thursday, 23 June 2011 at 17:22, address@hidden wrote:

Hi Guy - don't know about weights in igraph, but if you use tnet (built on
igraph, I believe) it specifically supports this. Function reference here:


Blog post describing the procedure here:


Once you have it as a weighted one-mode network, use other tnet functions
for weighted centrality measures (betweenness, degree, closeness).

Hope that helps.


On , Guy Bourne <address@hidden> wrote:


I'm looking to collapse large 2-mode networks into 1-mode networks to
analyse centrality between nodes in one vertext set. To do this I was
planning on using bipartite.projection, but I wasn't sure if the output
of this could be a weighted graph. The data that I've used doesn't seem
to produce repeated edges (presumably as the output is a simple graph) so
I was wondering if there was an option for a weighted graph output?

Thanks in advance for your time!

Kind regards,

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