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Subject: Re: unsorted eigenvalues
References: <fdhvq6$hok$1@fred.mathworks.com>
From: Peter Boettcher <boettcher@ll.mit.edu>
Message-ID: <muytzpeaonp.fsf@G99-Boettcher.llan.ll.mit.edu>
Organization: MIT Lincoln Laboratory
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Date: Fri, 28 Sep 2007 09:46:18 -0400
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"Robert Sparr" <robertdotsparr@NOSPAMsri.com> writes:

> I am aware that the eigenvectors have been sorted so that
> eigenvector index i corresponds to eigenvalue index i, and I
> know how to reconstruct the signal with the sorted output
> given by eig(), but that is not sufficient.  I also need to
> know the indexes that the significant eigenvalues had before
> they were sorted.

What is the true order of the roots of this polynomial?

x^3 - 2*x^2 +3*x -3

-Peter