Re: [igraph] basic question on selecting a vertex

[Charles Novaes de Santana]

Hi Simone,

Considering you have the names of your vertices in a variable named
"vertices", in a very straightforward way you could do:

v1<-which(vertices=="this");
v2<-which(vertices=="that");
g<-add.edges(g,c(v1,v2));

So, the R function you are looking for is called "which".

Surely there are other (more elegant) ways to do it, but that is the
one I remember now.

All the best,

Charles

On Tue, Mar 20, 2012 at 6:59 PM, Simone Gabbriellini
<address@hidden> wrote:
> Dear List,
>
> sorry for this very basic question, but I am trying to select a vertex
> based on the value of an attribute. I forgot the R syntax, and I got
> lost trying to pick it up again...
>
> I would like to create an edge between two nodes for which I only know
> the value of the attribute, like:
>
> add.edges(g, c( the-ID-of-vertex-with-name=="this",
> the-ID-of-vertex-with-name=="that"))
>
> can you please advice?
>
> Best,
> Simone
>
> --
> Dr. Simone Gabbriellini
>
> DigitalBrains srl
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-- 
Um axé! :)

--
Charles Novaes de Santana
http://www.imedea.uib-csic.es/~charles
PhD student - Global Change
Laboratorio Internacional de Cambio Global
Department of Global Change Research
Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB)
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