ModalTransform:

Path: Common/ControlGUI

% Transform the system a,b,c,d into modal form
 Creates a balanced realization of the system then uses the
 eigenvectors to transform into modal coordinates. The retained modes
 are specified by k.

 Type ModalTransform for a demo.
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   Form:
   g = ModalTransform( g )
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   ------
   Inputs
   ------
   g   (:)    State space system

   -------
   Outputs
   -------
   g   (:)    Modal form

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