EVDesMat:

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   Create the design matrix for the eigenstructure assignment technique.

   Since version 1.
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   Form:
   d = EVDesMat( nStates, kAssign )
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   Inputs
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   nStates         (1,1)    Number of states in the plant
   kAssign         (m)      States to be controlled

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   Outputs
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   d               (m,n)    Design matrix

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