GSS:

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   Compute the multivariable frequency response of the system.
   .
   x = ax + bu
   y = cx + du

   or

   G(s) = c*inv(sI-a)*b + d

   y(s) = G(s)*u(s)

   For example, for 3 outputs and 2 inputs g is of the form

                   w(1)               w(2)       ...
   output 1 [ input 1 input 2 | input 1 input 2 |... ]
   output 2 [ input 1 input 2 | input 1 input 2 |... ]
   output 3 [ input 1 input 2 | input 1 input 2 |... ]

   Since version 1.
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   Form:
   [g,nu,w] = GSS(a,b,c,d,iu,iy,w)
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   ------
   Inputs
   ------
   a                   Plant matrix
   b                   Input matrix
   c                   Measurement matrix
   d                   Input feedthrough matrix
   iu                  Inputs  ( = 0, or leave out for all)
   iy                  Outputs ( = 0, or leave out for all)
   w                   Frequency vector

   -------
   Outputs
   -------
   g                   Frequency response matrix
   nu                  Number of inputs
   w                   Frequency vector

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   References:	  Laub, A., "Efficient Multivariable Frequency Response
                 Computations," IEEE Transactions on Automatic Control,
                 Vol. AC-26, No. 2, April 1981, pp. 407-408.
                 Maciejowski, J. M., Multivariable Feedback Design, 
                 Addison-Wesley, Reading, MA, 1989, pp. 368-370.
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Children:

Common: Control/SizeABCD
Common: Control/WPZ