On Thu, Apr 10, 2014 at 12:31 PM, Bob Pap <[email protected]> wrote:
> Dear all,
>
> Unaware of any method for dealing with multigraphs (in my case a family of
> graphs "g" indexed by time), I handle these by creating a list, indexed by
> the time period, say "Mygraphs", where Mygraphs[["2014-01-01"]] returns
> graph g as it was in 2014-01-01.
>
> I face the need to extract a combination of attributes from the series (in
> the example below the vertex's "id" and "betweeness", ordered by the index
> of Mygraphs), I do so for example as follows:
>
> sapply(
> Mygraphs,
> function(g,id="identifierXX",attr="betweeness") {
> get.vertex.attribute(induced.subgraph(g, which(V(g)$name==id)),attr)
> }
> )
>
> I cannot help to think that the use of induced.subgraph could be obviated
> by specifying the 2 dimensions (id and attr) at once in the extraction, but
> I how would I restrict get.vertex.attribute to only return the value for
> vertex "identifierXX" only?
>
See the 'index' argument of 'get.vertex.attribute'.
http://igraph.org/r/doc/attributes.html
Gabor
>
> Any guidance would be appreciated.
> Kindly,
> Bob Pap
>
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