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Hi :)
on 4 Oct 2021
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[x y]=meshgrid(linspace(-2.5,2.5,70),linspace(-5.5,5.5,70));
z=exp(-x.^2-0.5*y.^2).*cos(4*x) + exp(-3*((x+0.5).^2+0.5*y.^2));
idx=(abs(z)>0.0005 );
z(idx)=0.001*sign(z(idx));
patch(surf2patch(surf(x,y,z)),'FaceColor','interp');
view(35,65);
colormap(cool);
grid,axis off
camlight headlight