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