petsc-3.7.1 2016-05-15
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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 Many br

Input Parameter

ksp -iterative context obtained from KSPCreate() Many br

Output Parameter

flg -PETSC_TRUE or PETSC_FALSE Many br

Options Database Key

-ksp_monitor_singular_value -Activates KSPSetComputeSingularValues() Many br

Notes

Currently this option is not valid for all iterative methods. Many br

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

Many br

Keywords

KSP, set, compute, singular values

See Also

KSPComputeExtremeSingularValues(), KSPMonitorSingularValue()

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