[igraph] Question about vertex ids

[Qunawei Zhang]

Hello:

I have a network used in the c code, so the vertex ids begin from "0" (the network is saved by node ids). Now I want to use R function to calculate some properties of some specific vertexes.

After I input the network into R, I found the ids are changed. As we know the ids begin from 1 in R. (I used the command read.graph(file="a_graph.txt",format="edge list")).

My understanding is that, the relationship between the ids under C(denoted as id_c) and that under R(denoted as id_R) is as follows: id_c+1=id_R. Right?

Thanks

Best

Quanwei