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Re: What method does octave use to get eigenvalues?


From: A S Hodel
Subject: Re: What method does octave use to get eigenvalues?
Date: Thu, 22 May 2003 10:09:12 -0500

Octave uses the lapack routines for computing eigenvalues. The technique is the standard Francis double-shift qr method (see Golub and van Loan's book,
Matrix Computations).

I think the file name in the c++ code is dblEig.cc or something like that; I don't have
the source code handy at this point.

On Tuesday, May 20, 2003, at 01:19 PM, Jeff Sadowski wrote:

What part of the source code deals with eigenvalues (what file
inparticular)
I was trying to think of how I would do it and I ran into a problem
of factoring nth degree polynomials I looked back at how I was taught
to do it and found no good answers they always had us guess and factor an
item out but that method doesn't work with me. I need an algorithmic
approch. Is there a way to get eigenvalues without factoring?
please point me to the code that does eigenvalues and or a good
web page describing a method of achieving eigenvalues without factoring.



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A. S. Hodel, Assoc. Prof, Dept. Elect & Comp Eng, Auburn University, AL 36849-5201 (334) 844-1854 200 Broun Hall address@hidden http://www.eng.auburn.edu/~scotte



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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
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Subscription information:  http://www.octave.org/archive.html
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