Nothing
balabanJ <- function(g, dist=NULL){
# check if g is a graphNEL object
if(class(g)[1]!="graphNEL"){
stop("'g' must be a 'graphNEL' object")
}
stopifnot(.validateGraph(g))
if(is.null(dist)){
dist <- distanceMatrix(g)
}
sum.dist <- rowSums(dist)
edges <- .edgesNoDupls(g)
Ji<-sapply(1:length(edges), function(i){
start <- names(edges[i])
targets <- names(edges[[i]])
1/sqrt(sum.dist[start] * sum.dist[targets])
})
nE <- numEdges(g)
nV <- numNodes(g)
return ( (nE/(nE-nV+2)) * sum(unlist(Ji)))
}
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