File: hess.cat

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scilab 2.6-4
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hess             Scilab Group             Scilab Function              hess
NAME
   hess - Hessenberg form
  
CALLING SEQUENCE
 H = hess(A)
 [U,H] = hess(A)
PARAMETERS
 A    : real or complex square matrix
      
 H    : real or complex square matrix
      
 U    : orthogonal or unitary square matrix
      
DESCRIPTION
   produces a unitary matrix U and a Hessenberg matrix H so that A = U*H*U'
  and U'*U = Identity.  By itself, hess(A) returns H.
  
   The Hessenberg form of a matrix is zero below the first  subdiagonal. If
  the matrix is symmetric or Hermitian, the form is tridiagonal.
  
EXAMPLE
 A=rand(3,3);[U,H]=hess(A);
 and( abs(U*H*U'-A)<1.d-10 )
SEE ALSO
   qr, contr, schur