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[igraph] Directed edgelist in ncol format?

From: Claudia Muller-Birn
Subject: [igraph] Directed edgelist in ncol format?
Date: Sun, 9 Jan 2011 09:58:40 +0100

Dear list,

I have a question regarding data import. I defined a network which is based on 
directed, weighted links. I actually simply export all defined networks in a 
ncol edge list format. When needed, by using Rsession, I read those edge lists 
following :

el <- "matrix(scan(ncol_file_path), byrow=TRUE, ncol=3)"
g <- "graph.data.frame(as.data.frame(el))"

The format I have defined is that the first column contains always the source 
of the connection and the second column the drain. O.k., if node X is in the 
first column and node Y in the second, then there should be a directed link 
from node X to node Y because X sent an email to Y. The third column contains 
the weight of this relationship, means in my case the frequency. 

In the documentation I found that the ncol format works only with undirected 
networks and I wanted to start to implement a Pajek export, well I was 
wondering if there is an easier way, and finally here my question:

Is there a way to adapt the above commands in a way that I obtain a directed 

Is the command:

g <- "as.directed(g)"

already enough to ensure the above requirement?

I appreciate any help. Thank you very much!

Cheers, Claudia

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