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[ Last edited by jimingw on 2010-4-22 at 05:32 ]
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zjliu1265

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jimingw

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[X,Y] = meshgrid(-2:.2:2);
Z = X.*exp(-X.^2 - Y.^2);
[DX,DY] = gradient(Z,.2,.2);
contour(X,Y,Z)
hold on
quiver(X,Y,DX,DY)
colormap hsv
hold off

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