Z2Damp:

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   Z domain to s domain damping and natural frequency.
  
   Computes the damping ratio and natural frequency for a set
   of eigenvalues of a discrete time plant.

   Since version 1.
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   Form: [zeta, w, wr, s] = Z2Damp( z, T )
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   Inputs
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   z                   Points in the z-plane
   T                   Sampling period

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   Outputs
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   zeta                Damping ratio
   w                   Natural frequency
   wr                  Resonant frequency
   s                   Equivalent s-plane poles

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Children:

Common: Control/S2Damp