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on 10 Oct 2021
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[u,w] = ndgrid(linspace(-pi,pi));
x=1/2*sin(2*u).*cos(2*w);
y=1/2*sin(u).*sin(2*w);
z=1/2*cos(u).*sin(2*w);
surf(x,y,z)
shading("interp")
grid off
axis off
view(0,-25);
camlight('left')
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