petsc-3.6.2 2015-10-02
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# SNESLineSearchGetTolerances

Gets the tolerances for the linesearch. These include tolerances for the relative and absolute change in the function norm, the change in lambda for iterative line searches, the minimum steplength, the maximum steplength, and the maximum number of iterations the line search procedure may take.

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode  SNESLineSearchGetTolerances(SNESLineSearch linesearch,PetscReal *steptol,PetscReal *maxstep, PetscReal *rtol, PetscReal *atol, PetscReal *ltol, PetscInt *max_its)

### Input Parameters

linesearch -linesearch context

### Output Parameters

| steptol | - The minimum steplength
| maxstep | - The maximum steplength
| rtol | - The relative tolerance for iterative line searches
| atol | - The absolute tolerance for iterative line searches
| ltol | - The change in lambda tolerance for iterative line searches
| max_it | - The maximum number of iterations of the line search

### Notes

Different line searches may implement these parameters slightly differently as the type requires.

### See Also

SNESLineSearchSetTolerances()

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