?? burglary.m
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% Burglar alarm exampleN = 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 2ns = 2*ones(1,N); % binary nodesbnet = 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 0nsamples = 100;samples = zeros(nsamples, 5);for i=1:nsamples samples(i,:) = cell2num(sample_bnet(bnet))';endend?? 快捷鍵說明
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