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Spinning top
on 4 Oct 2021
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u = linspace(-10, 10,1000);
v= linspace(0, 20,10);
[u,v] = meshgrid(u,v);
x = exp(-u./10).*sin(5.*u);
y = exp(-u./10).*cos(5.*u);
z = exp(u./10).*cos(5.*v);
surf(x,y,z)