Calculate number of common neighbors in igraph R

Question

Can anyone help me to find the number of common neighbors of two vertices using igraph R.

I tried to get this with following command but it returned with list().

intersect(neighborhood(graph=TD1,order=1,nodes=714),neighborhood(graph=TD1,order=1,nodes=4211))

>>>> list()

Thanks

Anna

Please include a minimal reproducible example. http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example — Gabor Csardi, Mar 10 '15 at 00:32

score 1 · Accepted Answer · answered Mar 10 '15 at 08:53

neighborhood() returns a list of integer vectors, one for each source node you passed in. Since you only have a single source node, you have to extract the first element of the list that neighborhood() returns before passing them to intersect():

intersect(
    neighborhood(graph=TD1, order=1, nodes=714)[[1]],
    neighborhood(graph=TD1, order=1, nodes=4211)[[1]]
)

Calculate number of common neighbors in igraph R

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