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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;
V = 2*cos(2*X).*X;
contour(X,Y,U+V,100,'-.')
hold on
q=quiver(X,Y,U,V,'r');
q.ShowArrowHead='off';
%q.LineSpec='dr';
q.LineWidth=0.5;
axis off
hold on
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