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on 7 Oct 2022
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xfun = @(t)sign(sin(t)).*(abs(sin(t))).^0.75;
yfun = @(t)sign(cos(t)).*(abs(cos(t))).^0.75;
zfun = @(t)abs(sin(t)).^2;
[X,Y,Z] = tubeN(@(t)0.1+0*t,20,@(t)[xfun(t), yfun(t), zfun(t)],[0,2*pi],500);
figure; s = surf(X,Y,Z, FaceColor = 'r', EdgeAlpha = 0.3); axis equal
camlight;

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