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on 7 Oct 2021
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[x,y]=meshgrid(-20:.3:20,-20:.3:20);
Fx=sin(x)-cos(y);
Fy=cos(x)-sin(y);
quiver(x,y,Fx,Fy)
D=divergence(x,y,Fx,Fy);
hold on
contour(x,y,D,"LineWidth",2,"LineColor","auto")
axis off
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