Re: [igraph] fastgreedy.community fails on Zachary karate club data set

[Liang Wang]

Thanks a lot, Tamas and Arun. Very much appreciated.

Regards,

Liang

---

From: Tamás Nepusz <address@hidden>
To: Help for igraph users <address@hidden>
Sent: Tue, January 25, 2011 11:27:43 PM
Subject: Re: [igraph] fastgreedy.community fails on Zachary karate club data set

Hi,

Try G <- simplify(G) to get rid of multiple edges in your graph; the karate club network should have only 34 vertices and 78 edges, while you have 154 edges.

--
Tamas

On 26 Jan 2011, at 02:23, Liang Wang wrote:

> Hi,
> 
> When I ran fastgreedy.community algorithm on the Karate data set,  I got an error message, as shown below. What am I doing wrong here?
> 
> Thanks a lot for your help.
> Liang
> 
> > G  <- read.graph('./krate0.txt',format="edgelist",directed="FALSE")
> > G
> Vertices: 34
> Edges: 154
> Directed: FALSE
> Edges:
> [0]    0 --  1
> [1]    0 --  2
> [2]    0 --  3
> [3]    0 --  4
> ....
> [150] 29 -- 33
> [151] 30 -- 33
> [152] 31 -- 33
> [153] 32 -- 33
> 
> > fc <- fastgreedy.community(G)
> Error in fastgreedy.community(G) :
>  At fast_community.c:540 : fast-greedy community finding works only on simple graphs, Invalid value
>
> 
>
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