Dear all
I used igraph in R to detect communities based on an unweighted unidirectional edge list like the following:
ID1 ID2
1278 2876
3354 9973
.....................
5350 6672
The edge list was saved in a CSV file :
"I:/network/ Edges 1997 to 1999.csv"
The code I wrote :
dat=read.csv(file.choose("I:/network/ Edges 1997 to 1999.csv"),header=TRUE)
el=as.matrix(dat)
el[,1]=as.character(el[,1])
el[,2]=as.character(el[,2])
g=graph.edgelist(el,directed=FALSE)
cluster_louvain(g,weights=NULL)
The code worked well. However, I couldn't figure out how to export the community detection results to a CSV file. I would like to have a dataset that looks like the following (the third column being the ID of a community that a row belongs to):
ID1 ID2 CommunityID
1278 2876 A
3354 9973 C
.....................
5350 6672 A
Thank you for your help in advance!