slepc-3.22.2 2024-12-02
PEPSetEigenvalueComparison
Specifies the eigenvalue comparison function when PEPSetWhichEigenpairs() is set to PEP_WHICH_USER.
Synopsis
#include "slepcpep.h"
PetscErrorCode PEPSetEigenvalueComparison(PEP pep,PetscErrorCode (*comp)(PetscScalar ar,PetscScalar ai,PetscScalar br,PetscScalar bi,PetscInt *res,void *ctx),void* ctx)
Logically Collective
Input Parameters
| pep | - eigensolver context obtained from PEPCreate()
|
| comp | - a pointer to the comparison function
|
| ctx | - a context pointer (the last parameter to the comparison function)
|
Calling sequence of comp
PetscErrorCode comp(PetscScalar ar,PetscScalar ai,PetscScalar br,PetscScalar bi,PetscInt *res,void *ctx)
| ar | - real part of the 1st eigenvalue
|
| ai | - imaginary part of the 1st eigenvalue
|
| br | - real part of the 2nd eigenvalue
|
| bi | - imaginary part of the 2nd eigenvalue
|
| res | - result of comparison
|
| ctx | - optional context, as set by PEPSetEigenvalueComparison()
|
Note
The returning parameter 'res' can be
| negative | - if the 1st eigenvalue is preferred to the 2st one
|
| zero | - if both eigenvalues are equally preferred
|
| positive | - if the 2st eigenvalue is preferred to the 1st one
|
See Also
PEPSetWhichEigenpairs(), PEPWhich
Level
advanced
Location
src/pep/interface/pepopts.c
Examples
src/pep/tutorials/nlevp/pdde_stability.c
Index of all PEP routines
Table of Contents for all manual pages
Index of all manual pages