final turnin
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1 changed files with 9 additions and 9 deletions
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@ -17,8 +17,8 @@ mu1 = [-1 -1];
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mu2 = [1 1];
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% Equal diagnoal covariance matrix
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Sigma1 = [1 0; 0 1];
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Sigma2 = [1 0; 0 1];
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% Sigma1 = [1 0; 0 1];
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% Sigma2 = [1 0; 0 1];
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% Diagnoal covariance matrix
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% Sigma1 = [1 0; 0 0.5];
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@ -31,22 +31,22 @@ mu2 = [1 1];
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x1 = -10:.1:10; x2 = -10:.1:10;
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% covariance matrix (increase the range for visualization)
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% Sigma1 = [1 0.1; 0.1 0.5];
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% Sigma2 = [0.5 0.3; 0.3 1];
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% x1 = -40:.1:40; x2 = -40:.1:40;
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Sigma1 = [1 0.1; 0.1 0.5];
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Sigma2 = [0.5 0.3; 0.3 1];
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x1 = -40:.1:40; x2 = -40:.1:40;
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[X1,X2] = meshgrid(x1,x2);
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%pdf1
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% F1 = mvnpdf([X1(:) X2(:)],mu1,Sigma1);
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F1 = mvndis([X1(:) X2(:)], mu1, Sigma1, prior1);
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F1 = reshape(prior1 * F1,length(x2),length(x1));
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F1 = reshape(F1,length(x2),length(x1));
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subplot(1,2,1);
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surf(x1,x2,F1); hold on;
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%pdf2
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% F2 = mvnpdf([X1(:) X2(:)],mu2,Sigma2);
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F2 = mvndis([X1(:) X2(:)], mu2, Sigma2, prior2);
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F2 = reshape(prior2 * F2,length(x2),length(x1));
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F2 = reshape(F2,length(x2),length(x1));
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surf(x1,x2,F2);
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caxis([min(F2(:))-.5*range(F2(:)),max(F2(:))]);
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axis([-4 4 -4 4 0 .4])
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@ -66,13 +66,13 @@ xlabel('x1'); ylabel('x2');
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function res = mvndis(X, mu, Sigma, prior)
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[len, ~] = size(X);
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[len, d] = size(X);
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res = zeros(len, 1);
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for i = 1:len
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x = X(i,:);
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mdist = (x - mu) * inv(Sigma) * (x - mu).';
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res(i) = -log(2*pi) - 1/2*log(det(Sigma)) - 1/2*mdist + log(prior);
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res(i) = -d/2*log(2*pi) - 1/2*log(det(Sigma)) - 1/2*mdist + log(prior);
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end
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% 1 x 2
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% (1 x 2) x ((2 x 2) x (2 x 1))
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