KSPSetComputeSingularValues#
Sets a flag so that 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 KSPSetComputeSingularValues(KSP ksp, PetscBool flg)
Logically Collective
Input Parameters#
ksp - iterative context obtained from
KSPCreate()flg -
PETSC_TRUEorPETSC_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.
See Also#
KSP: Linear System Solvers, KSPComputeExtremeSingularValues(), KSPMonitorSingularValue(), KSP, KSPSetComputeRitz()
Level#
advanced
Location#
Examples#
src/snes/tutorials/ex56.c
src/ksp/ksp/tutorials/ex56.c
src/snes/tutorials/ex30.c
src/ksp/ksp/tutorials/ex59.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages