how to specify the labels of vertices in R
I have an matrix as below:
jerry peter king jerry 1 0 0 peter 0 1 0 king 1 1 1
Now I am trying to draw a graph standing for the matrix with the code below:
t <- read.table("../data/table.dat"); adjm <- data.matrix(t); g1 <- graph.adjacency(adjm,add.colnames=NULL); plot(g1, main="social network", vertex.color="white", edge.color="grey", vertex.size=8, vertex.frame.color="yellow");
The labels of the vertices is the id, so my question is how do I set the label of the vertices by the dimnames of the matrix?
I have tried to the code
but get the wrong graph.
There are 2 ways to do this:
When you create the graph object, assign the names to a vertex attribute called label. This is the default that plot.igraph() looks for when plotting.
g1 <- graph.adjacency(adjm,add.colnames='label')
Use the V iterator to extract the name vertex attribute, which is how they are stored if you use add.colnames=NULL.
plot(g1, main="social network", vertex.color="white", edge.color="grey", vertex.size=8, vertex.frame.color="yellow", vertex.label=V(g1)$name)
Either way will give you your desired result. Something like: