petsc-3.3-p7 2013-05-11

SNESKSPGetParametersEW

Gets parameters for Eisenstat-Walker convergence criteria for the linear solvers within an inexact Newton method.

Synopsis

#include "petscsnes.h"  
#include "petscdmshell.h" 
#include "petscsys.h" 
PetscErrorCode  SNESKSPGetParametersEW(SNES snes,PetscInt *version,PetscReal *rtol_0,PetscReal *rtol_max,
                                                      PetscReal *gamma,PetscReal *alpha,PetscReal *alpha2,PetscReal *threshold)

Not Collective

Input Parameters

snes - SNES context

Output Parameters

	version	- version 1, 2 (default is 2) or 3
	rtol_0	- initial relative tolerance (0 <= rtol_0 < 1)
	rtol_max	- maximum relative tolerance (0 <= rtol_max < 1)
	gamma	- multiplicative factor for version 2 rtol computation (0 <= gamma2 <= 1)
	alpha	- power for version 2 rtol computation (1 < alpha <= 2)
	alpha2	- power for safeguard
	threshold	- threshold for imposing safeguard (0 < threshold < 1)

Keywords

SNES, KSP, Eisenstat, Walker, get, parameters

SNESKSPGetParametersEW

Synopsis

Input Parameters

Output Parameters

Keywords

See Also