[R] Howto modify a drawn graph with igraph

From: Etienne Cuvelier <etienne.cuvelier_at_ecp.fr>
Date: Sun, 06 Jun 2010 17:58:14 +0200


Hello,
I am using the igraph package, and I wonder how to add or modify informations on a drawn graph.

Example:
library(igraph)

M <- matrix( nc=12, nr=12 , 0)
M[ 1,]=c(0,1,0,0,1,1,0,0,0,0,0,0)
M[ 2,]=c(1,0,1,1,1,0,0,0,0,0,0,0)
M[ 3,]=c(0,1,0,0,0,1,1,0,0,0,0,0)
M[ 4,]=c(0,1,0,0,0,1,0,0,0,0,0,0)
M[ 5,]=c(1,1,0,0,0,0,0,0,0,0,0,0)
M[ 6,]=c(1,0,1,1,0,0,0,0,0,0,0,0)
M[ 7,]=c(0,0,1,0,0,0,0,1,1,0,0,1)
M[ 8,]=c(0,0,0,0,0,0,1,0,1,0,0,1)
M[ 9,]=c(0,0,0,0,0,0,1,1,0,0,1,1)
M[10,]=c(0,0,0,0,0,0,0,0,0,0,1,0)
M[11,]=c(0,0,0,0,0,0,1,0,1,0,0,0)
M[12,]=c(0,0,0,0,0,0,0,1,1,0,0,0)

g <- graph.adjacency( M,mode="undirected" ) mlayout= layout.kamada.kawai(g)
plot(g,layout=mlayout)

#And now howto add a weight associated on edges on the "picture"?
#Or howto change the color of an edge, or a vertice?

Thanks for help.

Etienne



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