Hi, I'm new with igraph (and R). I've created a graph with g15 <- graph_from_data_frame(SERs, directed = T, vertices = attr). "SERs" is a weighted graph (the third column is called weigth). "Attr" contains a vertex attribute M which identifies to which community or module a vertex belongs. How can I get the modularity of this clustering? I tried unsuccessfully: modularity(g15, g15$M, weights = g15$weight, ) . Any help? Thanks Per
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