Re: [igraph] How to get the vertex itself not the index

[Gábor Csárdi]

On Sat, Nov 15, 2014 at 6:56 AM, Fatemeh a <address@hidden> wrote:

Hi,

I would like to get the neighborhood of each vertex and get the community membership of each of them and the size of the each community which each vertex belong to , please consider this example :

karate <- graph.famous("Zachary")

karate <-as.matrix(karate)

What is the point of this line?

 

wckarate <- walktrap.community(karate) 

neigh_com <-sapply(graph.neighborhood(karate,1,nodes=V(karate)),function(g,x) {

        membership(wckarate)[V(g)] })

neigh_size <-sapply(graph.neighborhood(karate,1,nodes=V(karate)), function(g) {

   sizes(wckarate)[membership(wckarate)[V(g)] })

This gives me:

Error: unexpected '}' in:

"neigh_size <-sapply(graph.neighborhood(karate,1,nodes=V(karate)), function(g) {

   sizes(wckarate)[membership(wckarate)[V(g)] }"

 

the problem is that it is working with the index rather than the each vertex id itself, and when I use graph.neighborhood it will index each vertex all over again so it is all wrong how to avoid this ?

Yes, this is very inconvenient, and will be fixed in the next major release. Until then, you can just index V(karate)$name with the numeric ids to get the symbolic ids.

Gabor

 

thank you in advance,

fatemeh

--

regards

F..A

ᐧ

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