MSR:

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   Mean squared response of a system. It will use the e matrix for 
   the input matrix. If that matrix is empty it will use the b matrix.
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   Form:
   [x, y] = MSR( g, q )
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   ------
   Inputs
   ------
   g                 State space system
   q                 Spectral density of the white noise process
                     for 's' or mean squared value for 'z' or 'delta'

   -------
   Outputs
   -------
   x           (:)   State response
   y           (:)   Measurement response

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Children:

Common: Math/DLyapG
Common: Math/LyapG