InvSys:

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   Computes the inverse system.
   
   Computes the inverse system where y is the input and u the
   output.

   Since version 1.
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   Form: [ai, bi, ci, di] = InvSys( a, b, c, d )
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   ------
   Inputs
   ------
   a                   Plant matrix
   b                   Input matrix
   c                   Measurement matrix
   d                   Input feedthrough matrix

   -------
   Outputs
   -------
   ai                  Inverse plant matrix
   bi                  Inverse input matrix
   ci                  Inverse measurement matrix
   di                  Inverse input feedthrough matrix

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	References:	Maciejowski, J. M., Multivariable Feedback Design, 
               Addison-Wesley, Reading, MA, 1989, pp. 376-378.
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Children:

Common: Control/SizeABCD