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Flying mat
on 15 Oct 2021
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[th,r] = meshgrid((0:5:360)*pi/180,0:.05:1);
[X,Y] = pol2cart(th,r);
Z = X+i*Y;
f = (Z.^4-4).^(1/4);
surf(X,Y,abs(2*f+82))
hold on
surf(X,Y,zeros(size(X)))
axis off