RHSAutomobile:

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   Right hand side for a 2D automobile.
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   Form:
   xDot = RHSAutomobile( x, t, d )
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   Inputs
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   x	(6*n,1) State, [x;y;vX;vY;theta;omega]
   t         Time, unused
   d	(1,1)   Data structure
               .car	(n,1)  Car data structure
                              .mass  (1,1) Mass (kg)
                              .delta (1,1) Steering angle (rad)
                              .r     (2,4) Position of wheels (m)
                              .cDF   (1,1) Frontal drag coefficient
                              .cDS   (1,1) Side drag coefficient
                              .cF    (1,1) Friction coefficient
                              .fT    (1,1) Traction force (N)
                              .areaF (1,1) Frontal area for drag (m^2)
                              .areaS (1,1) Side area for drag (m^2)
                              .fRR   (1,2) [f0 K]

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   Outputs
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   x	(6*n,1)  d[x;y;vX;vY;theta;omega]/dt

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