petsc-3.14.5 2021-03-03
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# KSPGetComputeEigenvalues

Gets the flag indicating that the extreme eigenvalues values will be calculated via a Lanczos or Arnoldi process as the linear system is solved.

### Synopsis

    #include "petscksp.h"
    #include "petscmat.h"
    PetscErrorCode  KSPGetComputeEigenvalues(KSP ksp,PetscBool  *flg)

Not Collective

### Input Parameter

| ksp | - iterative context obtained from KSPCreate()

### Output Parameter

| flg | - PETSC_TRUE or PETSC_FALSE

### Notes

Currently this option is not valid for all iterative methods.

### See Also

KSPComputeEigenvalues(), KSPComputeEigenvaluesExplicitly(), KSP

### Level

advanced

### Location

src/ksp/ksp/interface/itfunc.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages