diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@tabular_CPD/Old/log_marg_prob_node_case.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/bnt/CPDs/@tabular_CPD/Old/log_marg_prob_node_case.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,22 @@
+function L = log_marg_prob_node_case(CPD, y, x)
+% LOG_MARG_PROB_NODE_CASE Compute prod_m log P(x(i,m)| x(pi_i,m)) for node i (tabular)
+% L = log_marg_prob_node_case(CPD, self_ev, parent_ev)
+% 
+% This is a slightly optimised version of log_marg_prob_node.
+% We assume we have exactly 1 case, i.e., y is a scalar and x is a vector (not a cell array).
+
+sz = CPD.sizes;
+nparents = length(sz)-1;
+
+% We assume the CPTs are already set to the mean of the posterior (due to update_params)
+
+switch nparents
+ case 0, p = CPD.CPT(y);
+ case 1, p = CPD.CPT(x(1), y);
+ case 2, p = CPD.CPT(x(1), x(2), y);
+ case 3, p = CPD.CPT(x(1), x(2), x(3), y);
+ otherwise,
+  ind = subv2ind(sz, [x y]);
+  p = CPD.CPT(ind);
+end
+L = log(p);