[R] Rgraphviz: How to control the colours of edges in a graph

From: Søren Højsgaard <Soren.Hojsgaard_at_agrsci.dk>
Date: Thu 06 Jul 2006 - 10:21:43 EST

Using Rgraphviz, I draw the undirected graph with vertices A,B,C and D and edges A:B, B:C, C:D, D:A, A:C. I want the vertices A and B to be red and C and D to be blue. The problem is the following: I want the edges A:B and B:C to be green and the edges C:D and C:A to be yellow, while the edge A:C can have the default colour black. I assume that I have to specify this using the edgeAttrs-argument in the plot function, but I can't figure out how. Can anyone help? Thanks.

Code for drawing the graph:  

   V <- c("A","B","C","D")
   E <- list(c("A","B"),c("B","C"),c("C","D"),c("D","A"),c("A","C"))    Eidx <- lapply(E, match, V)
   edL <- vector("list", length=length(V))    names(edL) <- V
   for (i in 1:length(Eidx)){

     tmp <- Eidx[[i]]
     edL[[tmp[1]]]$edges <- c(edL[[tmp[1]]]$edges, tmp[2])
     edL[[tmp[2]]]$edges <- c(edL[[tmp[2]]]$edges, tmp[1])
   G <- new("graphNEL", nodes=V, edgeL=edL)    nAttrs <- list()
   nAttrs$fillcolor <- c("red","red","blue","blue")    names(nAttrs$fillcolor) <- V

   plot(G, "neato",nodeAttrs=nAttrs)

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