KSPCGSetObjectiveTarget#

Sets the target value for the quadratic model reduction when the solver is used inside SNESNEWTONTR

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)

Note#

The KSPSolve() will stop when the current objective function 1/2xk∗A∗xk−b∗xk 1/2 x_k * A * x_k - b * x_k is smaller than obj if obj is negative. Otherwise the test is ignored.

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

Index of all KSP routines
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Index of all manual pages