Re: [igraph] assigning attributes to vertices

[Gábor Csárdi]

Hi Patrick,

On Sun, Nov 16, 2008 at 9:22 PM, patrick wintrode <address@hidden> wrote:
> Hi.
>
> To get a feel for igraph, I'm trying to reproduce the example in 
> "screenshots" where an Erdos-Renyi graph is colored by cluster size. I'm 
> using R instead of python (I'm also fairly new to R).
>
> After making the ER graph (named g), I did the following:
>
> cl <- clusters(g)$membership
> plot(g, layout=layout.fruchterman.reingold, vertex.size=6, vertex.label=NA, 
> vertex.color=cl)
>
> Obviously, this colors by cluster # and not by size. When I try:

Yeah, but actually it is incorrect, the cluster ids start with zero,
and the R colors are indexed from one. So you need

vertex.color=cl+1

> cm <- clusters(g)$csize
> plot(g, layout=layout.fruchterman.reingold, vertex.size=6, vertex.label=NA, 
> vertex.color=cm)
>
> The coloring is completely wrong.

Well, it is just the coloring you have specified....

> I'm wondering how to assign cluster size as an attribute to the vertices.

g <- erdos.renyi.game(300, 250, type="gnm")
clu <- clusters(g)
V(g)$csize <- clu$csize[ clu$membership+1 ]
V(g)$color <- as.integer(as.factor(V(g)$csize))
g$layout <- layout.fruchterman.reingold(g)
plot(g, vertex.size=4, vertex.label=NA)

Best,
Gabor

> Thanks.
>
> Patrick
>
>
>
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-- 
Gabor Csardi <address@hidden>     UNIL DGM