FlightPathAngleFromCartEl:

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   Compute the flight path angle from elements
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   Form:
   phi = FlightPathAngleFromCartEl( el )
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   ------
   Inputs
   ------
   el              (6,:) [a;i;w;W;e;M]

   -------
   Outputs
   -------
   phi             (1,:) Flight path angle

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   Reference: Bond, V. R., M. C. Allman, "Modern Astrodynamics".
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   Copyright (c) 2009 Princeton Satellite Systems, Inc.
   All rights reserved.
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Children:

Common: Graphics/Plot2D
Common: Math/Dot
Common: Math/DupVect
Common: Math/Unit