petsc-3.7.3 2016-07-24
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# SNESNGSGetTolerances

Gets various parameters used in convergence tests.

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode  SNESNGSGetTolerances(SNES snes,PetscReal *atol,PetscReal *rtol,PetscReal *stol,PetscInt *maxit)

Not Collective

### Input Parameters

| snes | - the SNES context
| atol | - absolute convergence tolerance
| rtol | - relative convergence tolerance
| stol | - convergence tolerance in terms of the norm of the change in the solution between steps
| maxit | - maximum number of iterations

### Notes

The user can specify NULL for any parameter that is not needed.

### Keywords

SNES, nonlinear, get, convergence, tolerances

### See Also

SNESSetTolerances()

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

### Examples

src/snes/examples/tutorials/ex5.c.html
src/snes/examples/tutorials/ex15.c.html
src/snes/examples/tutorials/ex19.c.html