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circle crashes 2150
on 31 Oct 2021
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figure(Color='k')
[X,Y] = meshgrid(-pi:pi/32:pi,-pi:pi/24:pi);
U = 2*sin(2*Y).*(X-pi).*(Y+pi).*(Y-pi).*(X+pi);
V = 2*cos(2*X).*(Y-pi).*(X+pi).*(Y+pi).*(X-pi);
contour(X,Y,U+V,100,'-d')
hold on
q=quiver(X,Y,U,V,'r');
% q.ShowArrowHead='off';
q.LineWidth=2.5;
axis off
hold on