NonlinearEstimator:

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   Implements an online approximator for a spring mass damper system.
   Uses radial basis functions. This is an example of the use of
   online approximators for fault detection. Calls OnlineApproximator.
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   Form:
   yEst = NonlinearEstimator( yEst, yMeas, t, d )	
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   ------
   Inputs
   ------
   yEst	(:,1)  [state;theta]
   yMeas	(2,1)  Measured state
   t       (1,1)  Time
   d       (1,1)  Input data structure
                  .plant (1,1)
                               .k0 (1,1) Spring stiffness
                               .c0 (1,1) Damping
                               .m  (1,1) Mass
                  .est   (1,1) 
                               .k  (1,1) Spring stiffness
                               .c  (1,1) Damping
                  .oA    (1,1)
                               .sigma    (1,1) Standard deviation
                               .c        (q,1) Centers
                               .thetaMax (1,1) Maximum parameter
                               .gamma    (1,1) Lyapunov gain

   -------
   Outputs
   -------
   yEst	(:,1)  [state;theta]

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Children:

Estimation: FDIROLA/OnlineApproximator