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#
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
Index of all KSP routines
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