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From: | Fatemeh a |
Subject: | Re: [igraph] subgraph in igraph |
Date: | Mon, 4 May 2015 18:28:07 +0430 |
How is this different from just calling induced.subgraph()? (Apart from being slower for small subgraphs of large graphs.)> g <- graph.ring(10)> V(g)$name <- LETTERS[1:10]> get.edgelist(get_sub_graph(6:10, g), names = FALSE)[,1] [,2][1,] 1 2[2,] 2 3[3,] 3 4[4,] 4 5> get.edgelist(induced.subgraph(g, 6:10), names = FALSE)[,1] [,2][1,] 1 2[2,] 2 3[3,] 3 4[4,] 4 5G.On Sun, May 3, 2015 at 5:47 PM, Peidong Chen <address@hidden> wrote:I think it is better to define functions by our own.get_sub_graph <- function(subGraphNodes,g){nonSubGraphNodes <- which(!((1:vcount(g)) %in% subGraphNodes))subGraph <- delete.vertices(g , nonSubGraphNodes)subGraph}2015-05-03 14:24 GMT-07:00 Fatemeh a <address@hidden>:thanks for your reply.this question raised because as you mention "induced.subgraph"actually dose that , but I checked it when we keep delete.vertices = FALSE and with one small example it dosen't change that, but i can't be sure and generalized it, so what about when we keep the vertices ?On Mon, May 4, 2015 at 1:39 AM, Peidong Chen <address@hidden> wrote:I think it changes nodes indices, because like "induced.subgraph" function creates a totally new indices different from the original graph2015-05-03 14:07 GMT-07:00 Fatemeh a <address@hidden>:_______________________________________________Hi all,I have a question regards subgraph, dose supgraph.edges function changes nodes indices?thank you in advance,Fatemeh--regardsF..A
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