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fabi2711
 Post subject: eigenvalues order
PostPosted: Thu Jun 09, 2011 4:52 pm 
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Joined: Thu Jun 09, 2011 4:37 pm
Posts: 1
I am trying to implement ALGLIB to solve an eigensystem, unfortunately, it seems that the library changes the order of the system during the solution. In my case, it is critical to preserve the order of the equations for later computations using the eigenvalues and the eigenvectors. Is there any way to track this changes to the system???

Thanks.
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Sergey.Bochkanov
 Post subject: Re: eigenvalues order
PostPosted: Fri Jun 10, 2011 8:41 am 
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No, there is no way to do so. The problem is that eigenvalues/eigenvectors can not be associated with original equations. Any eigenvalue (and its vector) "corresponds" to the whole system - not to one of its equations. And there is no such thing as "original order" of eigenvalues.

Can you describe your problem in more details?
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