Sorting eigenvalues and vectors together

Keith Goodman kwgoodman at
Fri Oct 27 12:23:46 CDT 2006

On 10/27/06, jeremito <jeremit0 at> wrote:
> I am using a = numpy.linalg.eig(A) to get the eigenvalues and
> eigenvectors.  I am interested only in the largest eigenvalue so I
> would like to sort the first element of a.  But if I do that, I won't
> know what is the associated eigenvector.  Is there a function that will
> sort the values and vectors together or do I need to write it myself.

You can get the ranking of the eigenvalues with idx =
a[0].argsort().argsort() or idx = (-a[0]).argsort().argsort(). And
then use that to sort both the eigenvalues and eigenvectors.

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