SlepcSortEigenvalues#

Sorts a list of eigenvalues according to the sorting criterion specified in a SlepcSC context.

Synopsis#

#include "slepcsys.h" 
PetscErrorCode SlepcSortEigenvalues(SlepcSC sc,PetscInt n,PetscScalar *eigr,PetscScalar *eigi,PetscInt *perm)

Not Collective

Input Parameters#

  • sc - the sorting criterion context

  • n - number of eigenvalues in the list

  • eigr - pointer to the array containing the eigenvalues

  • eigi - imaginary part of the eigenvalues (only when using real numbers)

Output Parameter#

  • perm - permutation array. Must be initialized to 0:n-1 on input.

Notes#

The result is a list of indices in the original eigenvalue array corresponding to the first n eigenvalues sorted in the specified criterion.

In real scalars, this functions assumes that complex values come in conjugate pairs that are consecutive (including purely imaginary ones).

See Also#

SlepcSCCompare(), SlepcSC

Level#

developer

Location#

src/sys/slepcsc.c

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