IDotS4:

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   Inertia derivative of S4 sail.
   This function has a built-in demo.

   Since version 7.
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   Form:
   Idot = IDotS4( t, d )
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   ------
   Inputs
   ------
   t                 (1,1)  Time
   d                  (:)   Data structure

   -------
   Outputs
   -------
   Idot              (3,3)   Inertia derivative

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   Reference: (Student Paper) Attitude Dynamics and Stability of Solar Sails
   During Deployment. LeFevre and Jha
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Children:

Common: Graphics/Plot2D