LeadLag:

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   Create a lead or lag with the appropriate phase characteristics
   in the form  

              tau1 s + 1
   K(s) = Kdc ----------
              tau2 s + 1

   Given the desired maximum phase magnitude (�90�) and frequency

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   Form:
   [a, b, c, d] = LeadLag( wmax, phasemax, Kdc, tSamp, sType )
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   ------
   Inputs
   ------
   wmax                  Frequency for max (rad/sec)
   phasemax              Max phase angle (deg)
   Kdc                   DC gain (db)
   tSamp                 Sampling period
   sType                 State equation type ('Delta' or 'Z')

   -------
   Outputs
   -------
   a                     Plant matrix
   b                     Input matrix
   c                     Measurement matrix
   d                     Feedthrough matrix

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Children:

Common: Control/C2DZOH
Common: Control/C2DelZOH
Common: Control/FResp
Common: Control/ND2SS