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Root finding procedure?

From: Thomas Hoffmann
Subject: Root finding procedure?
Date: Fri, 4 Jul 1997 08:02:50 +0200 (METDST)

I am looking for octave- or matlab-code, that allows me to find the
roots of the polynomial of x that results from det(H)=0, where the Hij
are polynomials in x theirself.
E.g.: find the roots x for

       3x-4    2x+9
det (                 ) = 0
       -x+22   4x-11

I can program such a procedure myself (with successive convolution),
but this problem seems standard enough to me, that there could be a
procedure out there in octave-land. 
Any hints?

Thomas Hoffmann.

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