petsc-3.14.6 2021-03-30

KSPGetComputeSingularValues

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

Synopsis

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

Not Collective

Input Parameter

ksp

- iterative context obtained from KSPCreate()

Output Parameter

flg

- PETSC_TRUE or PETSC_FALSE

Options Database Key

-ksp_monitor_singular_value

- Activates KSPSetComputeSingularValues()

Notes

Currently this option is not valid for all iterative methods.

Many users may just want to use the monitoring routine KSPMonitorSingularValue() (which can be set with option -ksp_monitor_singular_value) to print the singular values at each iteration of the linear solve.

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