diff toolboxes/FullBNT-1.0.7/bnt/CPDs/@gmux_CPD/CPD_to_pi.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/@gmux_CPD/CPD_to_pi.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,18 @@
+function pi = CPD_to_pi(CPD, msg_type, n, ps, msg, evidence)
+% CPD_TO_PI Compute the pi vector (gaussian)
+% function pi = CPD_to_pi(CPD, msg_type, n, ps, msg, evidence)
+
+switch msg_type
+ case 'd',
+  error('gaussian_CPD can''t create discrete msgs')
+ case 'g',
+  dps = ps(CPD.dps);
+  k = evidence{dps};
+  if isempty(k)
+    error('gmux node must have observed discrete parent')
+  end
+  m = msg{n}.pi_from_parent{k}; 
+  B = CPD.weights(:,:,k);
+  pi.mu = CPD.mean(:,k) + B * m.mu;
+  pi.Sigma = CPD.cov(:,:,k) + B * m.Sigma * B';
+end