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on 8 Oct 2021
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u=-.7:1e-3:.7;[U,V]=meshgrid(u,u);
n=primes(20);r=n.^.7;A=zeros(size(U));
for k=1:8
for h=1:n(k)
A=A+exp(1j*5*r(k)*(U*cos(7*h/n(k))+V*sin(6*h/n(k))));
end
end
M=abs(A).^.1;mesh(M.*U,M.*V,M.*sqrt(1-U.^2+V.^2),angle(A));
colormap(hsv.^.7)
view([90 75])
axis off
set(gcf,'Color','k')
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