igraph: Turn multiple edges into weights

On Tue, Aug 14, 2012 at 5:09 PM, Jonas Michaelis

Dear all,


I have some network data - about 300 vertices and several thousand edges. I
am looking for a way to turn multiple edges into weights of the edges. I
looked around and - surprisingly? - haven't found anything. Is there an
easy way to do this?

simplify() by default sums the edge weights, so just set all weights
to 1, and call simplify().

E.g.

## A graph with multiple edges
g <- graph.formula(A:A:A -- B:C:D, A -- B, simplify=FALSE)
str(g)
E(g)$weight <- 1
g2 <- simplify(g, remove.loops=FALSE)
str(g2, e=TRUE)

Best,
Gabor

Best, Jonas

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