[igraph] community.to.membership

[Susan Biancani]

Hi,
I'd like to identify two communities in my graph, using the edge.betweenness.community algorithm.  But when I try to run community.to.membership, I'm getting an error I don't understand.  

eb <- edge.betweenness.community(G)
pos.comm <- community.to.membership(G, eb$merges, steps=(length(V(G)))-2)

> pos.comm <- community.to.membership(G, eb$merges, steps=(length(V(G)))-2)
Error in community.to.membership(G, eb$merges, steps = (length(V(G))) -  : 
  At community.c:465 : `steps' to big or `merges' matrix too short, Invalid value
> 

My graph has 500 nodes, and eb$merges has length of 808. I chose steps=length(V(G))-2 in order to end up with two clusters in the end.  When I try this on a smaller subset of this graph, containing 50 nodes, and a merge matrix of length 98, this code works.  

Any suggestions would be appreciated!  Thanks,
Susan