Revision as of 12:21, 3 April 2010

Install the package under R environmemnt

type the command:

install.packages("igraph")

Starting with the package

don't forget to load the library:

library('igraph')

parse a network file in Pajek format and access to its memory representation through the variable 'g':

g <- read.graph(file='/your/path/.../file.net', format='pajek')

list vertex and their attributes of graph g:

V(g)                      # the list of all nodes
V(g)[0]                   # access the first node
list.vertex.attributes(g) # the list of all vertex attributes names
V(g)[0]$id                # access the attribute 'id' for the first node

list edges/arcs and their attributes of graph g:

E(g)                      # the list of all edges/arcs
E(g)[0]                   # access the first edge/arc
list.edge.attributes(g)   # the list of all edges/arcs attributes names
E(g)[0]$weight            # access the attribute 'weight' for the first node

draw the graph:

plot(g)