R igraph rename vertices

Question

Is there a possibility to rename the vertices in an igraph. I want to plot a certain graph multiple times with different notation on the vertices. Given the following igraph

Answer 1

You can use

ay <- set.vertex.attribute(az, "name", value=paste("y",1:27,sep=""))

Also works with "label" instead of "name".

Answer 2

If V(az) has both a set of 'name' attributes and a set of 'label' attributes, it is the 'label' attributes that get plotted.

> gt <- graph.tree(24, children = 4, mode=c("out", "in", "undirected"))
> V(gt)$name <- letters[1:24]
> plot(gt)   # So 'name's get displayed if no label is present
> V(gt)$label <- LETTERS[1:24]
> plot(gt)    # Labels get displayed
> V(gt)$name <- letters[1:24]  # see if then get overwritten 
> plot(gt)    # Still plots with 'label's