petsc-3.11.4 2019-09-28
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"
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.
Keywords
set, compute, singular values
See Also
KSPComputeExtremeSingularValues(), KSPMonitorSingularValue(), 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