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| Extracting eigenvectors from rmatrixevd http://forum.alglib.net/viewtopic.php?f=2&t=1087 |
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| Author: | Zeos [ Tue Dec 10, 2013 7:47 pm ] |
| Post subject: | Extracting eigenvectors from rmatrixevd |
Hi, I am using rmatrixevd to compute the eigenvalues and eigenvectors of a non-symmetric real matrix in C#. The code computes the eigenvalues correctly but when it comes to the eigenvectors, I am lost. These may be completely stupid and obvious questions but I have been working on this for few days and am not making any progress. I have three issues: 1. The results I obtain are very different from those I get using an online calculator. http://www.arndt-bruenner.de/mathe/scripts/engl_eigenwert.htm 2. The online calculator allows you to change the "norming mode" whereas rmatrixevd does not. What is the "norming mode" used in rmatrixevd. 3. For a test case I use a 4x4 matrix. As two of my eigenvalues are complex, and two are real, how do I extract the correct left and right eigenvectors corresponding to all my eigenvalues? My test matrix is 2 9 0 2 -1 2 1 0 0 0 3 0 0 0 1 -1 Any help would be greatly appreciated. Thank you very much. |
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