Nothing
zagreb2 <- function(g,deg=NULL){
if(class(g)[1]!="graphNEL"){
stop("'g' must be a 'graphNEL' object")
}
stopifnot(.validateGraph(g))
if(is.null(deg)){
deg <- graph::degree(g)
}
sum(.edgeApply(g, function(from, to) {
deg[from] * deg[to]
}, dupls=FALSE))
}
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