Nothing
.edgeDataMatrix <- function(g, att) {
if (class(g)[1] != "graphNEL")
stop("'g' has to be a 'graphNEL' object")
stopifnot(.validateGraph(g))
if (is.null(edgeDataDefaults(g)[[att]]))
stop(paste("edge attribute", att, "not set"))
raw <- edgeData(g)
n <- nodes(g)
m <- matrix(0, nrow=length(n), ncol=length(n), dimnames=list(n, n))
for (e in names(raw)) {
vert <- strsplit(e, "\\|")[[1]]
m[[vert[[1]], vert[[2]]]] <- raw[[e]][[att]]
}
m
}
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