petsc-3.12.5 2020-03-29
SNESNCGSetType
Sets the conjugate update type for SNESNCG.
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESNCGSetType(SNES snes, SNESNCGType btype)
Logically Collective on SNES
Input Parameters
| snes | - the iterative context
|
| btype | - update type
|
Options Database
-snes_ncg_type <prp,fr,hs,dy,cd> -strategy for selecting algorithm for computing beta
SNESNCGSelectTypes
| SNES_NCG_FR | - Fletcher-Reeves update
|
| SNES_NCG_PRP | - Polak-Ribiere-Polyak update
|
| SNES_NCG_HS | - Hestenes-Steifel update
|
| SNES_NCG_DY | - Dai-Yuan update
|
| SNES_NCG_CD | - Conjugate Descent update
|
Notes
SNES_NCG_PRP is the default, and the only one that tolerates generalized search directions.
It is not clear what "generalized search directions" means, does it mean use with a nonlinear preconditioner,
that is using -npc_snes_type <type>, SNESSetNPC(), or SNESGetNPC()?
Level
intermediate
Location
src/snes/impls/ncg/snesncg.c
Implementations
SNESNCGSetType_NCG in src/snes/impls/ncg/snesncg.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages