petsc-3.12.5 2020-03-29

SNESNGMRESSetSelectType

Sets the selection type for SNESNGMRES. This determines how the candidate solution and combined solution are used to create the next iterate.

#include "petscsnes.h" 
PetscErrorCode SNESNGMRESSetSelectType(SNES snes,SNESNGMRESSelectType stype)

Logically Collective on SNES

	snes	- the iterative context
	stype	- selection type

-snes_ngmres_select_type<difference,none,linesearch> -

	SNES_NGMRES_SELECT_NONE	- choose the combined solution all the time
	SNES_NGMRES_SELECT_DIFFERENCE	- choose based upon the selection criteria
	SNES_NGMRES_SELECT_LINESEARCH	- choose based upon line search combination

The default line search used is the L2 line search and it requires two additional function evaluations.

intermediate