SNESKSPSetParametersEW

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

Synopsis

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

Logically Collective

Input Parameters

• snes - SNES context

• 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)

Notes

Version 3 was contributed by Luis Chacon, June 2006.

Use PETSC_DEFAULT to retain the default for any of the parameters.

See Also

SNES: Nonlinear Solvers, SNES, SNESKSPSetUseEW(), SNESKSPGetUseEW(), SNESKSPGetParametersEW()

Level

advanced

Location

src/snes/interface/snes.c

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