SNESNGSSetTolerances

Sets various parameters used in convergence tests for nonlinear Gauss-Seidel SNESNCG

Synopsis

#include "petscsnes.h"  
PetscErrorCode SNESNGSSetTolerances(SNES snes, PetscReal abstol, PetscReal rtol, PetscReal stol, PetscInt maxit)

Logically Collective

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

Options Database Keys

• -snes_ngs_atol - Sets abstol

• -snes_ngs_rtol - Sets rtol

• -snes_ngs_stol - Sets stol

• -snes_max_it - Sets maxit

Notes

Use PETSC_CURRENT to retain the value for any parameter

All parameters must be non-negative

Developer Note

Why can’t the values set with SNESSetTolerances() be used?

See Also

SNES: Nonlinear Solvers, SNES, SNESNCG

Level

intermediate

Location

src/snes/impls/gs/snesgs.c

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Index of all SNES routines
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