Hermitian 'quasi' Toeplitz matrix eigensystem solution needed.

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#503

From: Carlos Riveros
Date: Fri, 11 Sep 1992 14:27

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Hi,

	I'm looking for a _fast_ algorithm/subroutine to compute the
eigenvalues/eigenvectors of a complex Hermitian 'almost Toeplitz' matrix,
that is a matrix that is complex Hermitian Toeplitz everywhere except in
the main diagonal, where all numbers are (real and) different.  Adicionally,
some of the sub/super-diagonals may be zeros.

	I don't need to compute all eigval/eigvec pairs, just those who are
greater than a given (negative) number.  I've found 'ch' EISPACK (*all* eigval/
eigvec of a complex hermitian matrix), and there are other routines to compute
just *some* eigval/eigvec of a complex general matrix, but I wonder if 
somebody knows of something more appropiate.

	Any information will be welcome.  Please respond by e-mail.  
Thanks in advance.

--Carlos Riveros		| Allied Geophysical Labs.
salrcr@archie.agl.uh.edu	| University of Houston.
agl3@jane.uh.edu

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From: agl3@jane.uh.edu (Carlos Riveros)
Subject: Hermitian 'quasi' Toeplitz matrix eigensystem solution needed.
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