Tag Archives: edge list

Extracting an edge list from a network object

I've been using the statnet suite of tools a lot recently.  As with any powerful software, there is quite a learning curve.  I will write some notes in my blog to help me remember tricks that I learn along the way.  And who knows? They might even be useful to other people!

For a variety of reasons, we have found it easy to import our networks as adjacency matrices.  The problem is that when there are attributes associated with the edges, it is much easier to deal with an edge list.  While using summary(net) yields an edge list as part of the summary, it was not clear to me how to get such a list as a manipulable object.  I wrote the statnet_help list and Carter Butts (co-author of network) pointed out to me that getting an edgelist is quite simple. Having read in our adjacency matrix

R:
  1. mat <-read.table("mat5.txt",header=TRUE)
  2. mat <- as.matrix(mat)
  3. net <- network(mat, directed=FALSE)

We can get the edge list like this:

R:
  1. bbb <- as.matrix(net,matrix.type="edgelist") 

Easy...