diff toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@ff_inf_engine/marginal_nodes.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/inference/dynamic/@ff_inf_engine/marginal_nodes.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,20 @@
+function marginal = marginal_nodes(engine, nodes, t)
+% MARGINAL_NODES Compute the marginal on the specified query nodes (ff)
+% marginal = marginal_nodes(engine, i, t)
+% returns Pr(X(i,t) | Y(1:T)), where X(i,t) is the i'th node in the t'th slice.
+% If enter_evidence used filtering instead of smoothing, this will return  Pr(X(i,t) | Y(1:t)).
+
+if nargin < 3, t = 1; end
+assert(length(nodes)==1);
+i = nodes(end);
+if myismember(i, engine.hnodes)
+  marginal = pot_to_marginal(engine.marginals{i,t});
+else
+  marginal = pot_to_marginal(dpot(i, 1, 1)); % observed
+end
+
+bnet = bnet_from_engine(engine);
+ss = length(bnet.intra);
+% we convert the domain to the unrolled numbering system
+% so that update_ess extracts the right evidence.
+marginal.domain = nodes+(t-1)*ss;