RHSTPVC:

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   Simulates a model of the vertical position of a plasma in a Tokamak.
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   Form:
   xDot = RHSTPVC( x, t, d )
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   Inputs
   ------
   x           (3,1) State [wA4;wB4;h]
   t           (1,1) Time
   d           (1,1) Structure
                     .a         (1,1) State space model
                     .b         (1,1)
                     .c         (1,1)
                     .d         (1,1)
                     .v         (1,1)
                     .eLM       (1,1) Edge limited mode disturbance

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   Outputs
   -------
   xDot        (3,1) State derivative

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   Reference: Scibile, L. and B. Kouvaritakis (2001.) "A Discrete Adaptive
              Near-Time Optimum Control for the Plasma Vertical Position 
              in a Tokamak." IEEE Transactions on Control System 
              Technology. Vol. 9, No. 1, January 2001.
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