Hi,
I am trying to convert a matrix into an edgelist in R. However, I cannot
find how I should treat isolates.
My matrix el looks like this
V1 V2
12345 29999
29999 34567
76543 NA
where the last row would represent an isolate.
When trying to use
g <- graph.edgelist(el, directed=F)
the result is the error
Error in graph(unname(ids[t(el)]), directed = directed) :
At type_indexededgelist.c:117 : cannot create empty graph with
negative number of vertices, Invalid value
After having got that error I tried to replace the NAs with the same
vertix id, so that I would get an edge like 1234 1234
However, this results in loop-edges and not isolates.
Any idea on how to treat isolates correctly? Thanks!
Tim
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