Mercurial > hg > camir-aes2014
view toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/Old/prob_node.m @ 0:e9a9cd732c1e tip
first hg version after svn
author | wolffd |
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date | Tue, 10 Feb 2015 15:05:51 +0000 |
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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);