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.TH hess G "April 1993" "Scilab Group" "Scilab Function"
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: real or complex square matrix
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: real or complex square matrix
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: orthogonal or unitary square matrix
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produces a unitary matrix \fVU\fR and a Hessenberg matrix \fVH\fR so
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that \fVA = U*H*U'\fR and \fVU'*U\fR = Identity. By itself, \fVhess(A)\fR
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The Hessenberg form of a matrix is zero below the first
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subdiagonal. If the matrix is symmetric or
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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 )