petsc-3.7.1 2016-05-15
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SNESKSPGetUseEW

Gets if SNES is using Eisenstat-Walker method for computing relative tolerance for linear solvers within an inexact Newton method.

Synopsis

#include "petscsnes.h"  
PetscErrorCode  SNESKSPGetUseEW(SNES snes, PetscBool  *flag)
Not Collective Many br

Input Parameter

snes -SNES context Many br

Output Parameter

flag -PETSC_TRUE or PETSC_FALSE Many br

Notes

Currently, the default is to use a constant relative tolerance for Many brthe inner linear solvers. Alternatively, one can use the Many brEisenstat-Walker method, where the relative convergence tolerance Many bris reset at each Newton iteration according progress of the nonlinear Many brsolver. Many br

Many br

Reference

S. C. Eisenstat and H. F. Walker, "Choosing the forcing terms in an Many brinexact Newton method", SISC 17 (1), pp.16-32, 1996. Many br

Keywords

SNES, KSP, Eisenstat, Walker, convergence, test, inexact, Newton

See Also

SNESKSPSetUseEW(), SNESKSPGetParametersEW(), 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