petsc-master 2017-09-20
Report Typos and Errors

SNESSetTolerances

Sets various parameters used in convergence tests.

Synopsis

#include "petscsnes.h"  
PetscErrorCode  SNESSetTolerances(SNES snes,PetscReal abstol,PetscReal rtol,PetscReal stol,PetscInt maxit,PetscInt maxf)
Logically Collective on SNES

Input Parameters

snes - the SNES context
abstol - absolute convergence tolerance
rtol - relative convergence tolerance
stol - convergence tolerance in terms of the norm of the change in the solution between steps, || delta x || < stol*|| x ||
maxit - maximum number of iterations
maxf - maximum number of function evaluations

Options Database Keys

-snes_atol <abstol> - Sets abstol
-snes_rtol <rtol> - Sets rtol
-snes_stol <stol> - Sets stol
-snes_max_it <maxit> - Sets maxit
-snes_max_funcs <maxf> - Sets maxf

Notes

The default maximum number of iterations is 50. The default maximum number of function evaluations is 1000.

Keywords

SNES, nonlinear, set, convergence, tolerances

See Also

SNESSetTrustRegionTolerance(), SNESSetDivergenceTolerance(), SNESSetForceIteration()

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