39 lines
616 B
Matlab
39 lines
616 B
Matlab
close all;
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clear;
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m = 50;
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arange = linspace(0,1,m);
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brange = linspace(.5,1.5, m);
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[A,B] = meshgrid(arange, brange);
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E = 0*A;
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x = linspace(-5,5,20);
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y = .5*x + 1 + randn(1, length(x));
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U = 0*A;
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V = 0*A;
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for i = 1:m
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for j = 1:m
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E(i,j) = lserr([A(i,j), B(i,j)], x, y);
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grad = lserr_gradient([A(i,j), B(i,j)], x, y);
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U(i,j) = grad(1);
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V(i,j) = grad(2);
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end
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end
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colormap('jet');
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surf(A,B,E, 'FaceAlpha',.5);
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%shading interp;
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hold on
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contour(A,B,E, 50, 'LineColor', 'k')
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quiver(A,B,U,V);
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xlabel('a');
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ylabel('b');
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zlabel('mean square error')
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axis([0,1,.5,1.5])
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