[X,Y] = meshgrid( - 2:0.25:2, - 1:0.2:1); Z = X.* exp( - X.^2 - Y.^2); [U,V,W] = surfnorm (X,Y,Z); quiver3(X,Y,Z,U,V,W,0.5); hold on surf(X,Y,Z); colormap ...
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