Hello,
I have encountered following problem in R:
I construct graph from a matrix of edges, but resulting graph has fewer edges than there is rows in the matrix.
# edges are stored in a matrix M
> head(M)
USEK1 USEK2
[1,] 985 866
[2,] 982 866
[3,] 1062 1039
[4,] 1088 1119
[5,] 1061 1088
[6,] 1060 1061
# matrix stores 3244 edges
> dim(M)
# number of vertices
> max(M)+1
> g <- graph.empty(n=max(M)+1,directed=T)
> g <- add.edges(g,M)
> g
IGRAPH D--- 2404 3242 --
#########
there are two edges missing.
Can anyone explain, what it the source of this behavior, and how can I fix it?
Best Regards,
Zbynek Janoska
Transport Research Centre
Olomouc, Czech Republic
address@hidden