Re: [igraph] extract network stats for a subset of nodes

[Gábor Csárdi]

On Mon, Oct 12, 2009 at 12:07 PM, Tamas Nepusz <address@hidden> wrote:
> Dear Will,
>
> I'm not an R expert, so there might be an easier way to do that, but
> this seems to work:
>
>> g <- grg.game(100, 0.2)
>> V(g)$name <- LETTERS
>> degree(g, which(V(g)$name %in% c("A", "F", "X")))

There is a small mistake here, the infamous 0-1 catch. Vertices are
numbered from zero, and which() returns indices starting from one. So
you need to subtract one.

It is a bit simpler to use match():
degree(g, match( c("A","F","X"), V(g)$name )-1)

G.

>
> --
> Tamas
>
>
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-- 
Gabor Csardi <address@hidden>     UNIL DGM