Nothing
# build an adjacency matrix from a graph.
amat = function(x) {
# check x's class.
check.bn.or.fit(x)
if (is(x, "bn"))
arcs2amat(x$arcs, names(x$nodes))
else
arcs2amat(fit2arcs(x), names(x))
}#AMAT
# rebuild the network structure using a new adjacency matrix.
"amat<-" = function(x, check.cycles = TRUE, check.illegal = TRUE, debug = FALSE,
value) {
# check x's class.
check.bn(x)
# a node is needed.
if (missing(value))
stop("no adjacency matrix specified.")
# check logical arguments.
check.logical(check.cycles)
check.logical(check.illegal)
check.logical(debug)
# check the adjacency matrix.
value = check.amat(amat = value, nodes = names(x$nodes))
# update the arcs of the network.
x$arcs = amat2arcs(value, names(x$nodes))
# check whether the the graph contains directed cycles.
if (check.cycles)
if (!is.acyclic(nodes = names(x$nodes), arcs = x$arcs, debug = debug,
directed = TRUE))
stop("the specified network contains cycles.")
# check whether any arc is illegal.
if (check.illegal) {
illegal = which.listed(x$arcs, x$learning$illegal)
if (any(illegal)) {
illegal = apply(x$arcs[illegal, , drop = FALSE], 1,
function(x) { paste(" (", x[1], ", ", x[2], ")", sep = "") })
stop("the following arcs are not valid due to the parametric assumptions of the network:",
illegal, ".")
}#THEN
}#THEN
# update the network structure.
x$nodes = cache.structure(names(x$nodes),
amat = as.integer(value), debug = debug)
return(x)
}#AMAT<-
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