Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/Old/prob_node.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
---|---|
date | Tue, 10 Feb 2015 15:05:51 +0000 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/Old/prob_node.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,51 @@ +function [P, p] = prob_node(CPD, self_ev, pev) +% PROB_NODE Compute prod_m P(x(i,m)| x(pi_i,m), theta_i) for node i (discrete) +% [P, p] = prob_node(CPD, self_ev, pev) +% +% self_ev(m) is the evidence on this node in case m. +% pev(i,m) is the evidence on the i'th parent in case m (if there are any parents). +% (These may also be cell arrays.) +% +% p(m) = P(x(i,m)| x(pi_i,m), theta_i) +% P = prod p(m) + +if iscell(self_ev), usecell = 1; else usecell = 0; end + +ncases = length(self_ev); +sz = dom_sizes(CPD); + +nparents = length(sz)-1; +if nparents == 0 + assert(isempty(pev)); +else + assert(isequal(size(pev), [nparents ncases])); +end + +n = length(sz); +dom = 1:n; +p = zeros(1, ncases); +if nparents == 0 + for m=1:ncases + if usecell + evidence = {self_ev{m}}; + else + evidence = num2cell(self_ev(m)); + end + T = convert_to_table(CPD, dom, evidence); + p(m) = T; + end +else + for m=1:ncases + if usecell + evidence = cell(1,n); + evidence(1:n-1) = pev(:,m); + evidence(n) = self_ev(m); + else + evidence = num2cell([pev(:,m)', self_ev(m)]); + end + T = convert_to_table(CPD, dom, evidence); + p(m) = T; + end +end +P = prod(p); +