Question: Polar plots for two differential equations



I have two differential equations describing a solar sail in 2D.

One is my radial direction and one is the tangential direction.

I have plotted r(t) and theta(t) but I want r(theta) so I have assigned my two differential equations and initial conditions, have my two plots for r and theta in terms of t and then I have used the following command to plot in polar coordinates:


odeplot(sol, [r(t), theta(t)], t = 0 .. 10, axiscoordinates = polar)

and my final result doesn't give the theta values that I want.

Can anyone help? 

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