Re: [igraph] leading.eigenvector.community

[Csardi Gabor]

Hmmm, I'm sorry for the delay, somehow I missed this email.... :(

The manual is incorrect, the 'eigenvector' and the 'eigenvalue' are
only returned by leading.eigenvector.community.step() and there is 
no option for them, they are always returned. 

If you want to have the eigenvector/eigenvalue for every split, then
call igraph.eigenvector.community.step() in a loop, until there 
is a split. The API is not very nice, but it should work.

You'll need to write a small loop, that recursively tries to split 
every "community", until there are no more splits. Please tell me if 
you experience more problems.

Best,
Gabor

On Fri, Aug 08, 2008 at 06:21:54PM +0900, MATSUDA, Noriyuki wrote:
> Hello:
> 
>   I am using igraph 0.5.1 and now working on  
> leading.eigenvector.community() and
>   community.le.to.membership().
> 
>   1) I want to obtain the largest eigenvalue and the associated  
> vectors.  The manual
>      says
>          eigenvector The eigenvector of the community matrix,
>           or NULL if the eigenvector argument was FALSE.
>          eigenvalue The largest positive eigenvalue of the  
> modularity matrix.
>     But, where should I put that argument.  I put eigenvector=T in  
> the two functions in vein.
>   2) It will be valuable if  leading.eigenvector.community() returns  
> the modularity at each
>      merge.
> 
> Thanks in advance as usual.
> 
> 
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK