KSPCGSetObjectiveTarget

Sets the target value for the CG quadratic model

Synopsis

#include "petscksp.h" 
PetscErrorCode KSPCGSetObjectiveTarget(KSP ksp, PetscReal obj)

Logically Collective

Input Parameters

• ksp - the iterative context

• obj - the objective value (0 is the default)

Notes

The KSPSolve() will stop when the current value of the objective function \(\frac{1}{2} x^H_k A x_k - b^H x_k\) is smaller than obj if obj is negative. Otherwise the test is ignored. This is used for example inside SNESNEWTONTR.

See Also

KSP: Linear System Solvers, KSP, KSPCG, KSPNASH, KSPSTCG, KSPGLTR, SNESNEWTONTR

Level

advanced

Location

src/ksp/ksp/impls/cg/cgtype.c

Implementations

KSPCGSetObjectiveTarget_CG() in src/ksp/ksp/impls/cg/cg.c

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