Many thanks dear Gabor. I think the following two should do (equivalent?)
1. function(g,id="identifierXX",attr="betweeness") {
get.vertex.attribute(g,attr)[which(V(g)$name==id)]
}
2. function(g,id="identifierXX",attr="betweeness") {
get.vertex.attribute(g,attr,V(g)[which(V(g)$name==id)])
}
Kindly,
Bob Pap
On 10 April 2014 18:45, Gábor Csárdi <[email protected]> wrote:
> 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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>>
>>
>
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