%HESS   Hessenberg form.
%   H = HESS(A) is the Hessenberg form of the matrix A.  
%   The Hessenberg form of a matrix is zero below the first
%   subdiagonal and has the same eigenvalues as A. If the matrix 
%   is symmetric or Hermitian, the form is tridiagonal.  
%
%   [P,H] = HESS(A) produces a unitary matrix P and a Hessenberg
%   matrix H so that A = P*H*P' and P'*P = EYE(SIZE(P)).

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.4 $  $Date: 1997/11/21 23:38:30 $
%   Built-in function.
