On Sat, Jan 12, 2013 at 11:35 AM, Biau David <[email protected]> wrote:
> OK thanks, > > but how do you delete the edges from the plot. When I plot(g) after the > command delete, it does not remove the edges from the graph > It was included in my example. Here it is again, together with the plot: library(igraph) g <- graph.ring(10) g <- delete.edges(g, E(g)[inc(1)]) plot(g) also, I could not find a 'legend' function for igraph. Should we do them > 'by hand'? > You can use the "regular" legend() function I believe. G. > > thanks and sorry for these trivial questions, > > best, > > > David Biau > > ------------------------------ > *De :* Gábor Csárdi <[email protected]> > *À :* Biau David <[email protected]>; Help for igraph users < > [email protected]> > *Envoyé le :* Samedi 12 janvier 2013 17h15 > *Objet :* Re: [igraph] igraph: how to select specific edges > > On Sat, Jan 12, 2013 at 10:36 AM, Biau David <[email protected]> wrote: > > Dear all, > > I would like to remove some edges from my network. I would like to remove > all edges connecting one specific vertex (e.g., V(g)[type=='a']) to > vertices which share a specific characteristic which I have identified (e.g., > V(g)[type=='b']) . I haven't found the way to identify these edges. > > Any idea? > > > See ?iterators: > > ‘inc’ takes a vertex sequence as an argument and returns ‘TRUE’ > for edges which have an incident vertex in it. > > E.g. > > library(igraph) > g <- graph.ring(10) > E(g)[inc(1)] > # Edge sequence: > # > # [1] 2 -- 1 > # [10] 10 -- 1 > > delete.edges(g, E(g)[inc(1)]) > # IGRAPH U--- 10 8 -- Ring graph > # + attr: name (g/c), mutual (g/x), circular (g/x) > > G. > > > > David Biau > > > _______________________________________________ > igraph-help mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/igraph-help > > > > > -- > Gabor Csardi <[email protected]> MTA KFKI RMKI > > > -- Gabor Csardi <[email protected]> MTA KFKI RMKI
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