Vertex Labels in igraph R

Question

I am using igraph to plot a non directed force network.

I have a dataframe of nodes and links as follows:

> links
  source target  value sourceID targetID
1      3      4 0.6245  1450552  1519842
2      6      8 0.5723  2607133  3051992
3      9      7 0.7150  3101536  3025831
4      0      1 0.7695   401517   425784
5      2      5 0.5535  1045501  2258363

> nodes
      name group size
1   401517     1    8
2   425784     1    8
3  1045501     1    8
4  1450552     1    8
5  1519842     1    8
6  2258363     1    8
7  2607133     1    8
8  3025831     1    8
9  3051992     1    8
10 3101536     1    8

I plot these using igraph as follows:

gg <- graph.data.frame(links,directed=FALSE)
plot(gg, vertex.color = 'lightblue', edge.label=links$value, vertex.size=1, edge.color="darkgreen", 
     vertex.label.font=1, edge.label.font =1, edge.label.cex = 1, 
     vertex.label.cex = 2 )

On this plot, igraph has used the proxy indexes for source and target as vertex labels.

I want to use the real ID's, in my links table expressed as sourceID and targetID.

So, for:

  source target  value sourceID targetID
1      3      4 0.6245  1450552  1519842

This would show as:

(1450552) ----- 0.6245 ----- (1519842)

Instead of:

      (3) ----- 0.6245 ----- (4)

(Note that the proxy indexes are zero indexed in the links dataframe, and one indexed in the nodes dataframe. This offset by 1 is necessary for igraph plotting).

I know I need to somehow match or map the proxy indexes to their corresponding name within the nodes dataframe. However, I am at a loss as I do no not know the order in which igraph plots labels.

How can I achieve this?

I have consulted the following questions to no avail:

Vertex Labels in igraph with R how to specify the labels of vertices in R R igraph rename vertices

Vertex Labels in igraph R

3 Answers