Re: [igraph] How to create a vertex sequence using vertex label?

[Gabor Csardi]

A bit better: 

V(g)[ name=="casserole" ]

you can use the vertex attributes when indexing V(g). Example:

> library(igraph)
> el <- matrix( c("foo", "bar", "bar", "foobar"), nc=2, byrow=TRUE)
> g <- graph.edgelist(el)
> g
Vertices: 3 
Edges: 2 
Directed: TRUE 
Edges:
                    
[0] foo    -> bar   
[1] bar    -> foobar
> V(g)[ name=="foo" ]
Vertex sequence:
[1] "foo"
> as.numeric(V(g)[ name=="foo" ])
[1] 0
> V(g)[ name %in% c("foo", "foobar") ]
Vertex sequence:
[1] "foo"    "foobar"

G.

On Tue, Jun 12, 2007 at 11:34:19PM +0200, address@hidden wrote:
> I havn't the good solution for retreiving a vertex using it's label.
> 
> Up to now, I use something like:
> 
>     V(g)[ which(V(g)$label == "casserole")-1 ]
> 
> which is very inelegant... What is the right solution?
> 
> Cheers,
> Sylvain
> 
> 
> 
> _______________________________________________
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK