Re: [igraph] Re: Calculating measures for a bunch of ego-networks

[Gábor Csárdi]

Magnus,

you can try the 0.6 development version, it has some improvements for
V() and E() and also for %--%. You can download it from
http://code.google.com/p/igraph/downloads/list

If you want all edges that connect two vertex sets, and your graph is
not changing much, then you can query the edge list of the graph and
extract the edges from there:

el <- get.edgelist(G)
which(el[,1] %in% myfrom & el[,2] %in% myto)-1

On a second thought, this is more or less what %--% is doing, so I am
not sure that it will be any faster.

Please tell me if the 0.6 version solves your problem. Thanks,
G.

On Thu, May 6, 2010 at 1:01 PM, Tamas Nepusz <address@hidden> wrote:
> Hi Magnus,
>
> Sorry, I've just seen your new message and it looks like you have
> already figured out what I said in my earlier email. I'm not that
> familiar with the internals of the R interface, so I cannot comment on
> the performance penalty of the %--% operator that you see -- let's hope
> Gabor can say more about that.
>
> --
> Tamas
>
>
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-- 
Gabor Csardi <address@hidden>     UNIL DGM