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Phase plane (I can't use quiver)

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Francisco Molina
Francisco Molina on 21 May 2020
I have this system myth a simple PID controller
u = -Kp*(x(1) - theta_d) - Ki*(x(3)) - Kd*(x(2));
dxdt(1) = x(2);
dxdt(2) = (-l*Fg*sin(x(1)))/I - (l*x(2))/I + (g*l*u)/I;
dxdt(3) = x(1)-theta_d;
dxdt = dxdt';
but I can't to apply the quiver command, the figure don´t show anything.
Can someone help me please. Thanks, regards!

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R2020a