SizeAC:

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   Checks the dimensions of the set a, c for consistency. 
   These are the state transition and state input matrices.

   Since version 2.
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   Form:
   notOK = SizeAC( a, c )
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   ------
   Inputs
   ------
   a                   Plant matrix
   c                   Measurement matrix

   -------
   Outputs
   -------
   notOK               Not correct if equal to 0

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