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annotate toolboxes/FullBNT-1.0.7/bnt/CPDs/@discrete_CPD/CPD_to_lambda_msg.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function lam_msg = CPD_to_lambda_msg(CPD, msg_type, n, ps, msg, p, evidence)
wolffd@0 2 % CPD_TO_LAMBDA_MSG Compute lambda message (discrete)
wolffd@0 3 % lam_msg = compute_lambda_msg(CPD, msg_type, n, ps, msg, p, evidence)
wolffd@0 4 % Pearl p183 eq 4.52
wolffd@0 5
wolffd@0 6 switch msg_type
wolffd@0 7 case 'd',
wolffd@0 8 T = prod_CPT_and_pi_msgs(CPD, n, ps, msg, p);
wolffd@0 9 mysize = length(msg{n}.lambda);
wolffd@0 10 lambda = dpot(n, mysize, msg{n}.lambda);
wolffd@0 11 T = multiply_by_pot(T, lambda);
wolffd@0 12 lam_msg = pot_to_marginal(marginalize_pot(T, p));
wolffd@0 13 lam_msg = lam_msg.T;
wolffd@0 14 case 'g',
wolffd@0 15 error('discrete_CPD can''t create Gaussian msgs')
wolffd@0 16 end