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#

Options Database Key#

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#

src/ksp/ksp/interface/itfunc.c

Examples#

src/ksp/ksp/tutorials/ex56.c
src/snes/tutorials/ex30.c
src/ksp/ksp/tutorials/ex59.c
src/snes/tutorials/ex56.c


Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages