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| utilities for whitelists and blacklists {bnlearn} | R Documentation |
Get or create whitelists and blacklists
Description
Extract whitelists and blacklists from an object of class bn, or create them for use in
structure learning.
Usage
whitelist(x)
blacklist(x)
ordering2blacklist(nodes)
tiers2blacklist(tiers)
set2blacklist(set)
Arguments
x |
an object of class |
nodes, set |
a vector of character strings, the labels of the nodes. |
tiers |
a vector of character strings or a list, see below. |
Details
ordering2blacklist() takes a vector of character strings (the labels of the nodes), which
specifies a complete node ordering. An object of class bn or bn.fit; in that
case, the node ordering is derived from the graph. In both cases, ordering2blacklist() returns
a blacklist containing all the possible arcs that violate the specified node ordering.
tiers2blacklist() takes (again) a vector of character strings (the labels of the nodes),
which specifies a complete node ordering, or a list of character vectors, which specifies a partial node
ordering. In the latter case, all arcs going from a node in one list element (sometimes known as
tier) to a node in previous elements are blacklisted. Arcs between nodes in the same element are
not blacklisted.
set2blacklist() creates a blacklist containing all the arcs between any two of the nodes
whose labels are passed as the argument set.
Value
whitelist() and blacklist() return a matrix of character strings with two
columns, named from and to, if a whitelist or a blacklist has been used to learn
the bn object passed as their argument.
ordering2blacklist(), tiers2blacklist() and set2blacklist()
return a sanitized blacklist (a two-column matrix, whose columns are labelled
from and to).
Author(s)
Marco Scutari
Examples
tiers2blacklist(list(LETTERS[1:3], LETTERS[4:6]))
set2blacklist(LETTERS[1:3])
ordering2blacklist(LETTERS[1:6])
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