Re: [igraph] A very elementary question

[Tamás Nepusz]

Let's generate a random graph using preferential attachment as an example:

library(igraph)
g <- barabasi.game(25, m=2)

Let's add some weights just for the sake of our example:

E(g)$weight <- seq(1, ecount(g))

Also, let's add some node labels:

V(g)$label <- LETTERS[1:vcount(g)]

Now, we have to assign the edge weights as the "label" attribute to the edges:

E(g)$label <- E(g)$weight

Finally, we can plot the graph:

plot(g)

It's no different if you imported your graph from Pajek; use 
list.vertex.attributes() and list.edge.attributes() to find the names of your 
vertex/edge attributes and decide which one should be assigned to the "label" 
attributes of the vertices/edges. If you want to vary the edge width instead of 
using edge labels, assign a numeric vector to the "weight" attribute of the 
edges (i.e. E(g)$weight).

-- 
T.