Re: [igraph] Question about the result of community structure detection

[Gabor Csardi]

Another possible error is that you don't initialize the results
vector/matrix before calling the _community_fastgreedy function.

You need to send us some small piece of example code you're 
using, otherwise it is hard to find out the reason.

If you want to find the split which gives the maximum 
modularity then you need to search for the maximum in the 
'modularity' vector and then call igraph_community_to_membership
with the right 'steps' parameter.

These things (and everything else) are much easier to do from R/Python;
if you know one of these languages, you might consider to 
switch.

Gabor

On Thu, Feb 28, 2008 at 11:19:54AM +0100, Tamas Nepusz wrote:
> Hi,
> 
> I assume you are using the C core of igraph directly. How did you  
> examine the contents of the merge matrix? Please note that  
> igraph_matrix_t objects contain floats and not integers, so the proper  
> way to print an element of the matrix if you know that it contains  
> integers is:
> 
> printf("%ld\n", (long)MATRIX(m, i, j));
> 
> Please let me know if that resolved your issue.
> 
> Regards,
> -- 
> Tamas
> 
> On 2008.02.28., at 8:59, Zhigang Wu wrote:
> 
> >Dear all,
> >Sorry about the wrong display of my question. In fact, I only want  
> >to record
> >the detail communities
> >(say, the real node sets of each community) when the modularity  
> >property
> >reaches the maximum.
> >Is there anybody who can tell me how to do that?
> >Thanks a lot!
> >Regards
> >Zhigang Wu
> >
> >
> >
> >_______________________________________________
> >igraph-help mailing list
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> >http://lists.nongnu.org/mailman/listinfo/igraph-help
> 
> 
> 
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-- 
Csardi Gabor <address@hidden>    UNIL DGM