KSPComputeExtremeSingularValues

Computes the extreme singular values for the preconditioned operator. Called after or during KSPSolve() (SLESSolve()).

Synopsis

int KSPComputeExtremeSingularValues(KSP ksp,double *emax,double *emin)
Not Collective

Input Parameter

ksp -iterative context obtained from KSPCreate()

Output Parameters

emin, emax -extreme singular values

Notes

One must call KSPSetComputeSingularValues() before calling KSPSetUp() (or use the option -ksp_eigen) in order for this routine to work correctly.

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

Keywords

KSP, compute, extreme, singular, values

See Also

KSPSetComputeSingularValues(), KSPSingularValueMonitor(), KSPComputeEigenvalues()

Location: src/ksp/interface/itfunc.c
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