Re: [igraph] Can I subset a "communities" object based on communities sizes?

[capitano . nemo]

But if I contract the graph how would I then find the vertices belonging 
to small communities to remove them?

Il 24.11.2013 21:42 Gábor Csárdi ha scritto:
> How about contracting the graph first, and then removing the vertices
> that belong to the small communities after?
>
> G.
>
> On Sun, Nov 24, 2013 at 4:34 PM,  <address@hidden> wrote:
> > I have an object "communities" with few large communities and many
> > communities with just few members. I would like to create a community 
> > graph
> > to plot (with one node for each community) but excluding communities 
> > with
> > less than 20 members.
> >
> > I was able to subset the graph based on membership to largest 
> > communities
> > with
> >
> >     ids <- which(sizes(communities)>20)
> >     subgraph <- induced.subgraph(graph, which(membership(communities) 
> > %in%
> > id))
> >
> > Now I wanted to apply this (from
> > http://stackoverflow.com/a/12699979/1707938) to my case
> >
> >    contractgraph <- contract.vertices(subgraph, 
> > membership(communities))
> >    E(contractgraph)$weight <- 1
> >    contractgraph2 <- simplify(contractgraph, remove.loops=FALSE)
> >
> > But of course I have a problem because "subgraph" and "communities" 
> > have
> > different length. How could I proceed? Should I try to subset 
> > "communities"
> > based on sizes(communities)>20?
> >
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