[R] Color Nodes

[Eric Berger]

You may want to change the color of the vertex labels. e.g.
plot(g, vertex.size = 20, vertex.label.dist = 0.5,
      vertex.color = V(g)$color, vertex.label.color="cyan")



On Thu, Oct 27, 2022 at 1:52 AM Jeff Reichman <reichmanj using sbcglobal.net> wrote:
>
> Yes Rui that will work for my needs thank you
>
> -----Original Message-----
> From: Rui Barradas <ruipbarradas using sapo.pt>
> Sent: Wednesday, October 26, 2022 4:40 PM
> To: reichmanj using sbcglobal.net; R-help using r-project.org
> Subject: Re: [R] Color Nodes
>
> Às 21:37 de 26/10/2022, Jeff Reichman escreveu:
> > R-Help
> >
> >
> >
> > For those of you who use igraph is there a way to highlight (color)
> > particular notes. For example if I want to color the "Peter" node red
> > and everything else blue  or leave default) how would I do that or can
> > I do that. Seems as though I might create an attribute column - maybe??
> >
> >
> >
> > Jeff
> >
> >
> >
> > library(igraph)
> >
> >
> >
> > # define links in data
> >
> > edges <- rbind(c("Dave", "Jenny"), c("Peter", "Jenny"), c("John",
> > "Jenny"), c("Dave", "Peter"), c("Dave", "John"), c("Peter", "Sam"),
> > c("Sam", "Albert"), c("Peter", "John"))
> >
> >
> >
> > # generate and plot graph
> >
> > # set argument directed = FALSE in graph.edgelist() to plot an
> > undirected graph.
> >
> > g <- graph.edgelist(edges, directed = FALSE)
> >
> > plot(g, vertex.size = 1, vertex.label.dist = 0.5)
> >
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> Hello,
>
> After creating the graph, set the vertices colors by subsetting V(g).
> Here are two exaples, the first color Peter red and leave the others with their default color. The second, color the other vertices blue.
>
>
>
> V(g)["Peter"]$color <- "red"
>
> plot(g, vertex.size = 20, vertex.label.dist = 0.5,
>       vertex.color = V(g)$color)
>
> V(g)$color <- "blue"
> V(g)["Peter"]$color <- "red"
> plot(g, vertex.size = 20, vertex.label.dist = 0.5,
>       vertex.color = V(g)$color)
>
>
>
> Hope this helps,
>
> Rui Barradas
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.