Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/log_prob_node.m @ 0:e9a9cd732c1e tip
first hg version after svn
| author | wolffd |
|---|---|
| date | Tue, 10 Feb 2015 15:05:51 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/log_prob_node.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,12 @@ +function L = log_prob_node(CPD, self_ev, pev) +% LOG_PROB_NODE Compute sum_m log P(x(i,m)| x(pi_i,m), theta_i) for node i (discrete) +% L = log_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, p] = prob_node(CPD, self_ev, pev); % P may underflow, so we use p +tiny = exp(-700); +p = p + (p==0)*tiny; % replace 0s by tiny +L = sum(log(p));