Dear Guillermo, I guess the eigenvectors are the rows, not the columns, and they are normalized! Regards, Luis
On Tue, Jul 05, 2022 at 03:05:16PM -0300, Guillermo P. Ortiz wrote: > Dear PDL developers, > > Trying to use meigen() for eigenvalue problem with matrix 4x4 without > threading for now, I realize that eigenvalues seems did not have any > ordered output, is not it? > > In the first example below the second eigenvalue is larger than the first > > =========== > Matrix: > > [ > [ 0 1 0 > 0] > [ 1.19256986494742 0 -0.00449505340171719 > 0] > [ 0 0 0 > -1] > [ 0.00449505340171719 0 -1.20412391559198 > 0] > ] > > Eigenvalue: > > [1.09134187427168 1.09802854880944 -1.09134187427168 -1.09802854880944] > > Right Eigenvector (tranposed matrix) > > [ > [ 0.638990630564561 0.697357232402369 0.219312399660024 > -0.23934480529599] > [ 0.218583370045276 0.240010780604692 -0.636866523154502 > 0.699297624204653] > [-0.638990630564568 0.697357232402378 -0.219312399660001 > -0.239344805295965] > [-0.218583370045231 0.240010780604642 0.636866523154517 > 0.69929762420467] > ] > > In the second example, neither, and also the eigenvectors seem not be > normalized > Matrix: > > [ > [ 0 1 0 > 0] > [ 1.18623905553229 0 -3.55105833627078e-10 > 0] > [ 0 0 0 > -1] > [ 3.55105833627078e-10 0 -1.21150887543497 > 0] > ] > > [1.08914602121676 -1.08914602121676 1.10068563878838 -1.10068563878838] > > > Thank you in advance. > Regards > > -- > > > Dr. Guillermo P. Ortiz > Electromagnetismo Aplicado > Dto. Física, Facultad de Ciencias Exactas > Universidad Nacional del Nordeste > Avda Libertad 5460, W3404AAS Corrientes, > Argentina. > (+54) 379-4424678 interno 4613 > gortiz* at *unne edu ar > _______________________________________________ > pdl-devel mailing list > pdl-de...@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pdl-devel -- o W. Luis Mochán, | tel:(52)(777)329-1734 /<(*) Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\ Av. Universidad s/n CP 62210 | (*)/\/ \ Cuernavaca, Morelos, México | moc...@fis.unam.mx /\_/\__/ GPG: 791EB9EB, C949 3F81 6D9B 1191 9A16 C2DF 5F0A C52B 791E B9EB _______________________________________________ pdl-general mailing list pdl-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pdl-general
