slepc-3.20.1 2023-11-27
EPSSetEigenvalueComparison
Specifies the eigenvalue comparison function when EPSSetWhichEigenpairs() is set to EPS_WHICH_USER.
Synopsis
#include "slepceps.h"
PetscErrorCode EPSSetEigenvalueComparison(EPS eps,PetscErrorCode (*func)(PetscScalar ar,PetscScalar ai,PetscScalar br,PetscScalar bi,PetscInt *res,void *ctx),void* ctx)
Logically Collective
Input Parameters
| eps | - eigensolver context obtained from EPSCreate()
|
| func | - a pointer to the comparison function
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| ctx | - a context pointer (the last parameter to the comparison function)
|
Calling sequence of func
PetscErrorCode func(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
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| res | - result of comparison
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| ctx | - optional context, as set by EPSSetEigenvalueComparison()
|
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
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| positive | - if the 2st eigenvalue is preferred to the 1st one
|
See Also
EPSSetWhichEigenpairs(), EPSWhich
Level
advanced
Location
src/eps/interface/epsopts.c
Examples
src/eps/tutorials/ex18.c
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages