% Make the following network (from Jensen (1996) p84 fig 4.17)%    1%  / | \% 2  3  4% |  |  |% 5  6  7%  \/ \/%  8   9% where all arcs point downwardsN = 9;dag = zeros(N,N);dag(1,2)=1; dag(1,3)=1; dag(1,4)=1;dag(2,5)=1; dag(3,6)=1; dag(4,7)=1;dag(5,8)=1; dag(6,8)=1; dag(6,9)=1; dag(7,9) = 1;ns = [5 4 3 2 2 1 2 2 2]; % vector-valued nodes%ns = ones(1,9); % scalar nodesdnodes = [];bnet = mk_bnet(dag, ns, 'discrete', []);rand('state', 0);randn('state', 0);for i=1:N  bnet.CPD{i} = gaussian_CPD(bnet, i);endclear engine;engine{1} = gaussian_inf_engine(bnet);engine{2} = jtree_inf_engine(bnet);[err, time] = cmp_inference_static(bnet, engine);