Nothing
chow.liu.backend = function(x, nodes, estimator, whitelist, blacklist,
conditional = NULL, debug = FALSE) {
# fix the whitelist and the blacklist to keep the C side simple.
if (!is.null(blacklist)) {
# arcs must be blacklisted in both directions, so keep only
# the undirected ones.
blacklist = blacklist[which.undirected(blacklist, nodes), , drop = TRUE]
# keep only one direction for each blacklisted arc.
blacklist = pdag2dag.backend(blacklist, nodes)
}#THEN
if (!is.null(whitelist)) {
# keep only one direction for each whitelisted arc.
whitelist = pdag2dag.backend(whitelist, nodes)
# the chow-liu algorithms allows the selection of exactly length(nodes) arcs,
# so the whitelist must contain less.
if (nrow(whitelist) > length(nodes))
stop("too many whitelisted arcs, there can be only ", length(nodes), ".")
}#THEN
.Call(call_chow_liu,
data = x,
nodes = nodes,
estimator = estimator,
whitelist = whitelist,
blacklist = blacklist,
complete = attr(x, "metadata")$complete.nodes,
conditional = conditional,
debug = debug)
}#CHOW.LIU.BACKEND
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