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on 5 Oct 2021
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[y,x] = meshgrid(-65:0.4:65);
r = sqrt(x.^2+y.^2);
Phi = angle(x+y*1i);
z = sin(8*log(r+2)+2*Phi);
surf(x,y,z), shading interp;
colormap('winter');
set(gcf,'Color','k'), set(gca,'Color','k');
axis square, axis off;
view(-44,81);
camlight head, camlight left, camlight right, camlight(0,-90);
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