comparison toolboxes/FullBNT-1.0.7/bnt/examples/static/burglary.m @ 0:e9a9cd732c1e tip

first hg version after svn

+% Burglar alarm example
+
+N = 5;
+dag = zeros(N,N);
+E = 1; B = 2; R = 3; A = 4; C = 5;
+dag(E,[R A]) = 1;
+dag(B,A) = 1;
+dag(A,C)=1;
+
+% true = state 1, false = state 2
+ns = 2*ones(1,N); % binary nodes
+bnet = mk_bnet(dag, ns);
+
+bnet.CPD{E} = tabular_CPD(bnet, E, [0.1 0.9]);
+bnet.CPD{B} = tabular_CPD(bnet, B, [0.01 0.99]);
+%bnet.CPD{R} = tabular_CPD(bnet, R, [0.65 0.00001 0.35 0.99999]);
+bnet.CPD{R} = tabular_CPD(bnet, R, [0.65 0.01 0.35 0.99]);
+bnet.CPD{A} = tabular_CPD(bnet, A, [0.95 0.8 0.3 0.001 0.05 0.2 0.7 0.999]);
+bnet.CPD{C} = tabular_CPD(bnet, C, [0.7 0.05 0.3 0.95]);
+
+
+engine = jtree_inf_engine(bnet);
+ev  = cell(1,N);
+ev{C} = 1;
+engine = enter_evidence(engine, ev);
+mE = marginal_nodes(engine, E);
+mB = marginal_nodes(engine, B);
+fprintf('P(E|c)=%5.3f, P(B|c)=%5.3f\n', mE.T(1), mB.T(1))
+
+ev{C} = 1;
+ev{R} = 1;
+engine = enter_evidence(engine, ev);
+mE = marginal_nodes(engine, E);
+mB = marginal_nodes(engine, B);
+fprintf('P(E|c,r)=%5.3f, P(B|c,r)=%5.3f\n', mE.T(1), mB.T(1))
+
+
+if 0
+nsamples = 100;
+samples = zeros(nsamples, 5);
+for i=1:nsamples
+  samples(i,:) = cell2num(sample_bnet(bnet))';
+end
+end