[R] igraph and plotting connected components
Gabor Csardi
csardi at rmki.kfki.hu
Tue Oct 9 11:26:06 CEST 2007
Dieter,
there are a couple of ways to do this in igraph, eg.
you can decompose the graph into separate components with
g <- erdos.renyi.game(100, 1/100)
graphs <- decompose.graph(g)
and then you will have a list of graphs. If you assign some vertex
ids as vertex attributes then you can keep track of which vertex is
in which component:
V(g)$label <- seq(vcount(g))
graphs <- decompose.graph(g)
and eg. to plot the largest component:
largest <- which.max(sapply(graphs, vcount))
plot(graphs[[largest]], layout=layout.fruchterman.reingold)
Or you can use a layout algorithm which is not troubled by the
unconnected graph, like Fruchterman-Reingold:
plot(g, layout=layout.fruchterman.reingold)
Gabor
On Mon, Oct 08, 2007 at 05:27:52PM -0700, Dieter Best wrote:
> Hello there,
>
> I am using the igraph package to build graphs from my data. If I plot a graph though, it's not easy for me to see what's going on. Does anybody know how to rearrange a graph to get a plot without too many crossing lines? Maybe other packages?
>
> Thanks a lot in advance for any pointers,
>
> -- D
>
>
>
>
>
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--
Csardi Gabor <csardi at rmki.kfki.hu> MTA RMKI, ELTE TTK
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