petsc-master 2014-12-24
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SNESKSPGetParametersEW

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

Synopsis

#include "petscsnes.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

See Also

SNESKSPSetUseEW(), SNESKSPGetUseEW(), SNESKSPSetParametersEW()

Level:advanced
Location:
src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages