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 - SNES context

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#

src/snes/interface/snes.c

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