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 Parameter#
snes -
SNEScontext
Output Parameters#
version - version 1, 2 (default is 2), 3 or 4
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)
See Also#
SNES: Nonlinear Solvers, SNES, SNESKSPSetUseEW(), SNESKSPGetUseEW(), SNESKSPSetParametersEW()
Level#
advanced
Location#
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages