SFunc:

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   An example s-function that interfaces mfiles to Simulink. It implements
   the function
 
   dx/dt = f( t, x, u );

   This is a simple simulation of an orbit. To customize this
   function you need to:

   Edit the top of the main function to initialize your model
   Edit ModelInitializeSizes to set up the model state, input and output
         dimensions
   Edit ModelDerivatives to have your right hand side
   Edit ModelOutputs to output your outputs

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   Form:
   [sys, x0, str, ts] = SFunc( t, x, u, flag )
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   ------
   Inputs
   ------
   t                  Time
   x                  State
   u                  Inputs
   flag               Simulink control flag

   -------
   Outputs
   -------
   ssys, x0, str, ts  Required Simulink outputs

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Children:

Common: Database/Constant
Math: Linear/Mag