Nothing
harary <- function(g, dist=NULL){
# check if g is a graphNEL object
if(class(g)[1]!="graphNEL"){
stop("'g' must be a 'graphNEL' object")
}
if(is.null(dist)){
dist <- distanceMatrix(g)
}
return ( sum(1/(dist[dist!=0]))/2)
}
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