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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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```