ELM:

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   Disturbance in a Tokamak plasma due to edge localized modes (ELMs). 
   These disturbances repeat. Thus, every tau3, set t = 0.
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   Form:
   eLM = ELM( tau1, tau2, k, t )
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   ------
   Inputs
   ------
   tau1        (1,1) Time constant 1
   tau2        (1,1) Time constant 2
   k           (1,1) Gain
   t           (1,:) Time

   -------
   Outputs
   -------
   d            (1,: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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Children:

Common: Graphics/Plot2D