VarGausP:

Path: Orbit/OrbitMechanics

% Computes the right hand side of the Gauss variational equations.
   Based on the Gauss formulation with the acceleration
   in polar coordinates. These equations are singular
   when i = 0.

   Since version 1.
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   Form:
   dElDt = VarGausP( el, aD, tol, mu )
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   ------
   Inputs
   ------
   el                    Elements vector [a,i,W,w,e,M]
   aD                    Disturbance vector [r,theta,z] (default is zeros)
   tol                   Tolerance for Kepler's equation solver (0.0001)
   mu                    Gravitational parameter (3.98600436e5;)

   -------
   Outputs
   -------
   dElDt                 Derivative to the elements

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   References: Battin, R.H., An Introduction to the Methods and Mathematics
               of Astrodynamics, AIAA, New York, 1987, pp. 484-490.
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Children:

SC: BasicOrbit/E2Nu
SC: BasicOrbit/M2EEl

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