ZOH:

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   Create a model of a zero-order-hold using Pad� approximants.
   The ZOH will be scaled by 1/T as if it had a sampler in the
   loop.

   Since version 1.
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   Form:
   [a, b, c, d] = ZOH( T, n )
   [num, den]   = ZOH( T, n )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   T                   Hold period
   n                   Number of terms (optional)

   -------
   Outputs
   -------
   a or num            Numerator polynomial or plant matrix
   b or den            Denominator polynomial or input matrix
   c                   Measurement matrix
   d                   Feedthrough matrix

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Children:

Common: Control/FResp
Common: Control/ND2SS
Math: Analysis/Pade
Math: Analysis/SubPoly