S2Damp:

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   Computes the damping ratio and natural frequency for a set
   of eigenvalues of a continuous time plant.
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   Form:
   [zeta, w, wR] = S2Damp( s )
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   Inputs
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   s                   Eigenvalues

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   Outputs
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   zeta                Damping ratio
   w                   Natural frequency
   wR                  Resonant frequency

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