slepc-main 2024-11-22
NEPSetEigenvalueComparison
Specifies the eigenvalue comparison function when NEPSetWhichEigenpairs() is set to NEP_WHICH_USER.
Synopsis
#include "slepcnep.h"
PetscErrorCode NEPSetEigenvalueComparison(NEP nep,PetscErrorCode (*comp)(PetscScalar ar,PetscScalar ai,PetscScalar br,PetscScalar bi,PetscInt *res,void *ctx),void* ctx)
Logically Collective
Input Parameters
| nep | - eigensolver context obtained from NEPCreate()
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| comp | - a pointer to the comparison function
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| ctx | - a context pointer (the last parameter to the comparison function)
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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
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| ai | - imaginary part of the 1st eigenvalue
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| br | - real part of the 2nd eigenvalue
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| 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 NEPSetEigenvalueComparison()
|
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
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See Also
NEPSetWhichEigenpairs(), NEPWhich
Level
advanced
Location
src/nep/interface/nepopts.c
Index of all NEP routines
Table of Contents for all manual pages
Index of all manual pages