RouthArray:

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   Computes the Routhian array for a polynomial.

   Type RouthArray for a demo.
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   Form:
   r = RouthArray( p )
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   ------
   Inputs
   ------
   p         (1,n)  Polynomial

   -------
   Outputs
   -------
   r         (n,:)  Routh array       

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  Reference: http://classes.engr.arizona.edu/ame558/public_html
             /topic1/page2.html
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