Path: Orbit/OrbitMechanics

% Compute the gravitational acceleration in cartesian coordinates. 
 Acceleration vectors are a [ aX;aY;aZ ].

 If the gravity coefficients are normalized, an additional matrix
 multiplication is required. The normalization matrix is stored as a persistent
 variable but AGravityC will gracefully update it the normalization or order of
 the model changes between calls.
   %   [aG, aS, aZ, aT] = AGravityC( r, nN, nM, d )  % structure
   [aG, aS, aZ, aT] = AGravityC( r, nN, nM, s, c, j, mu, a, useNormM )

   r           (3,:)    Position vector
   nN          (1,1)    Highest zonal harmonic (m = 0)
                        (empty gives the max #) 
   nM          (1,1)    Highest sectorial and tesseral harmonic 
                        (empty gives the max #) 
   d            (.)     Gravity model struct
   s           (:,:)    S terms
   c           (:,:)    C terms
   j             (:)    m = 0 terms
   mu          (1,1)    Spherical gravitational potential
   a           (1,1)    Planet radius
   useNormM    (1,1)    Generate the normalization matrix (default false)

   aG           (3,:)   Total gravitational acceleration km/sec^2
   aS           (3,:)   Spherical term                   km/sec^2
   aZ           (3,:)   Zonal term                       km/sec^2
   aT           (3,:)   Tesseral term                    km/sec^2

	 Reference:   Bond, V. R. and M. C. Allman (1996.) Modern Astrodynamics.
               Princeton. pp. 212-213.
               Lerch, F. J., Klosko, S. M., Labuscher, R. E., Wagner,
               C.A., "Gravity Model Improvement GEOS-3 (GEM 9 & 10)," 
               N78-10645, September, 1977.
               Gottlieb, R. G., "Fast Gravity, Gravity Partials,
               Normalized Gravity, Gravity Graident Torque and Magnetic
               Field: Derivation, Code and Data, NASA CR 188243, February,
   See also UnnormalizeGravity, AGravity (which outputs in spherical


Common: CommonData/SwooshWatermark
Common: General/CellToMat
Common: General/DeBlankLT
Common: General/DispWithTitle
Common: General/MatToCell
Common: General/Watermark
Common: Graphics/Mesh2
Common: Graphics/NewFig
Common: Graphics/Plot2D
Common: Graphics/PltStyle
Common: Graphics/XLabelS
Common: Graphics/YLabelS
Common: Graphics/ZLabelS
Math: Linear/DupVect
Math: Linear/Factorl
Orbit: GravityModels/LoadGEM
Orbit: GravityModels/NormalizationMatrix
Orbit: GravityModels/UnnormalizeGravity

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