Plotting phase plane from system of second order ODEs
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María Jesús
el 14 de Oct. de 2015
Comentada: Star Strider
el 14 de Oct. de 2015
Hi,
I'm using ode45 to solve a system of two second order ODEs (writing it as a system of 4 first order ODEs)
du(1) = u(3); %u'
du(2) = u(4); %v'
du(3) = c*u(3) - (1 - u(1) - a1*u(2))*u(1); %u
du(4) = (c/d)*u(4) - (r/d)*(1- a1*u(1) - u(2))*u(2); %v
I would like to plot a phase plane portrait of two of these (du(1) and du(2)). Is there a way to do this?
Thanks!!
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Star Strider
el 14 de Oct. de 2015
See the odeset documentation for Description of Solver Output Properties, particularly for ‘OutputFcn’ and the odephas2 option. That’s the easiest way.
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Star Strider
el 14 de Oct. de 2015
My pleasure!
For arrows, you will need to use the quiver or quiver3 plot functions. Use the hold function to overplot the arrows on the phase plot.
Sorry for the delay — MATLAB Answers is apparently undergoing some sort of upgrade just now and I didn’t see your reply. It would normally pop to the top of the stack, but didn’t.
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