I am not sure if there is a bug in your case. ARPACK is a numeric algorithm, and sometimes fails to converge. Make sure your graph is connected, that helps.
Gabor On Thu, Jul 17, 2014 at 12:58 PM, Pagliari, Roberto <[email protected]> wrote: > Hi Gabor, > Thank you for the quick feedback. > > So I guess for now there is no fix, right? I saw those other messages, but I > could not find anyone confirming bug fixes. > > Thank you, > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Gábor Csárdi > Sent: Thursday, July 17, 2014 12:49 PM > To: Help for igraph users > Subject: Re: [igraph] Newman's clustering failing [Python] > > YEs, a bunch of people get issues with ARPACK, just search for ARPACK in the > issue tracker. > > Gabor > > On Thu, Jul 17, 2014 at 12:46 PM, Pagliari, Roberto <[email protected]> > wrote: >> I’m testing the leading eigenvector method for community detection. >> >> >> >> · I tested it with a bipartite weighted graph. >> >> · Weights are all real numbers in (0, 1] >> >> · I created the graph without using the specific function for >> creating bipartite graphs. >> >> · The number of nodes and edges is fairly small (order of 100) so I >> don’t think that should be an issue. >> >> >> >> I am getting this error, due to arpack not converging. Did anyone else >> see this issue? >> >> >> >> /usr/lib/python2.6/site-packages/python_igraph-0.7-py2.6-linux-x86_64.egg/igraph/__init__.py:1047: >> RuntimeWarning: ARPACK solver failed to converge (3001 iterations, 0/1 >> eigenvectors converged) at arpack.c:776 >> >> membership, _, q = GraphBase.community_leading_eigenvector(self, >> clusters, >> **kwds) >> >> >> >> Thank you, >> >> >> _______________________________________________ >> igraph-help mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/igraph-help >> > > _______________________________________________ > igraph-help mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/igraph-help > _______________________________________________ > igraph-help mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/igraph-help _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
