[Numpy-discussion] One question about the numpy.linalg.eig() routine
Mon Apr 2 20:15:56 CDT 2012
2012/4/2 Hongbin Zhang <email@example.com>:
> Dear Python-users,
> I am currently very confused about the Scipy routine to obtain the
> eigenvectors of a complex matrix.
> In attached you find two files to diagonalize a 2X2 complex Hermitian
> matrix, however, on my computer,
> If I run python, I got:
> [[ 0.80322132+0.j 0.59500941+0.02827207j]
> [-0.59500941+0.02827207j 0.80322132+0.j ]]
> If I compile the fortran code, I got:
> ( -0.595009410289, -0.028272068905) ( 0.802316135182, 0.038122316497)
> ( -0.803221321796, 0.000000000000) ( -0.595680709955, 0.000000000000)
> From the scipy webpage, it is said that numpy.linalg.eig() provides nothing
> an interface to lapack zheevd subroutine, which is used in my fortran code.
> < /div>
> Would somebody be kind to tell me how to get consistent results?
I should also point out that matlab and octave give the same answer as
your Fortran routine:
octave:15> H=[0.6+0.0j, -1.97537668-0.09386068j;
0.60000 + 0.00000i -1.97538 - 0.09386i
-1.97538 + 0.09386i -0.60000 + 0.00000i
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