Hi Shafique, If your edgelist is in the form of a text file (elist.csv) that looks like this:
from, to, weight vertex1, vertex2, 3 vertex2, vertex3, 2.3 vertex4, vertex1, 1.2 ... you can convert that to a matrix using library(igraph) edge.list <- read.csv(elist.csv,header=TRUE) g <- graph.data.frame(edge.list, directed=FALSE) get.adjacency(g, type="both", attr="weight") More options for exporting the adjacency matrix are here: http://igraph.sourceforge.net/doc/R/conversion.html If you give more details about your data format you might get more specific help. HTH, Gary On Apr 11, 2011, at 6:00 AM, r-help-requ...@r-project.org wrote: > > > > > > ---------------------------------------- >> Date: Sat, 9 Apr 2011 14:34:28 -0700 >> From: kmshafi...@yahoo.com >> To: r-help@r-project.org >> Subject: [R] Converting edgelist to symmetric matrix >> >> Hi, >> I have network data in the form of a couple of edgelists containing weights >> in >> the format "x,y,weight" whereby x represents row header and y represents >> column >> header. All edgelists are based on links among 634 nodes and I need to >> convert >> them into a 634*634 weighted matrix. >> >> > > not find >> a clue how to do this in R. Any help will be appreciated. > > I'm trying to do something related and found > > ?read.graph > > will format=ncol do what you need? This apparently creates a graph object > that likely > has capacilities you need.? Again, I haven't actually used any of this > just found while trying to solve a different problem. > > 'It is a simple text file > with one edge per line. An edge is defined by two symbolic vertex > names separated by whitespace. (The symbolic vertex names > themselves cannot contain whitespace. They might followed by an > optional number, this will be the weight of the edge; the number > can be negative and can be in scientific notation. If there is no > weight specified to an edge it is assumed to be zero. > ' > >> >> Best regards, >> Shafique >> > > -- Gary Weissman http://www.babelgraph.org/ g...@babelgraph.org [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
