Nothing

```
# Cosine vertex similarity/ Salton index
#
# Similarity measure based on resource allocation process.
#
# This function measures the cosine of the angle between columns of
# the adjacency matrix, corresponding to given nodes.
#
similarity_cos <- function(graph, v1, v2, ...){
deg <- igraph::degree(graph)
score <- igraph::cocitation(graph, v = v1)
score <- score[, v2]
score <- score / outer(deg[v1], deg[v2], function(x, y) sqrt(x * y))
score
}
```

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