KSPCGSetRadius#

Sets the radius of the trust region used by the KSPCG when the solver is used inside SNESNEWTONTR

Synopsis#

#include "petscksp.h" 
PetscErrorCode KSPCGSetRadius(KSP ksp, PetscReal radius)

Logically Collective

Input Parameters#

  • ksp - the iterative context

  • radius - the trust region radius (0 is the default that disable the use of the radius)

Note#

When radius is greater then 0, the Steihaugh-Toint trick is used

See Also#

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

Level#

advanced

Location#

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

Implementations#

KSPCGSetRadius_CG() in src/ksp/ksp/impls/cg/cg.c
KSPCGSetRadius_GLTR() in src/ksp/ksp/impls/cg/gltr/gltr.c
KSPCGSetRadius_NASH() in src/ksp/ksp/impls/cg/nash/nash.c
KSPCGSetRadius_STCG() in src/ksp/ksp/impls/cg/stcg/stcg.c


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Index of all manual pages