Re: [igraph] community_fastgreedy() requires integers as edge weights?

[Tamas Nepusz]

> Using the fastgreedy community detection with edge weights i get the  
> following error:
Yes, you're right, that's a bug. It has been fixed in the following  
patch:
http://cneurocvs.rmki.kfki.hu/cgi-bin/archzoom.cgi/address@hidden/igraph--main--0.6--patch-42/interfaces/python/src/igraphmodule.c.diff?diff
There are many patches waiting to be backported to the 0.5 tree before  
the upcoming release of igraph 0.5.1 (which will fix this bug and some  
others as well).

I think the bug appears only if you supply an attribute name to  
g.community_fastgreedy() (e.g. g.community_fastgreedy("weight")). Try  
to supply the weight vector instead, I reckon this will serve as a  
workaround till 0.5.1.

--
Tamas

> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "graphmeasures.py", line 226, in getCom
>     vcG = G.community_leading_eigenvector()
>   File "build/bdist.macosx-10.3-fat/egg/igraph/__init__.py", line  
> 437, in community_fastgreedy
> TypeError: sequence elements must be integers
>
> If i understand the algorithm, it should be quite happy with  
> floats.  Am I wrong? Is this a bug?
>
> -Kurt J
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