TaoSetTolerances

Sets parameters used in TAO convergence tests

Synopsis

#include "petsctao.h" 
PetscErrorCode TaoSetTolerances(Tao tao, PetscReal gatol, PetscReal grtol, PetscReal gttol)
Logically collective on Tao

Input Parameters

tao - the Tao context
gatol - stop if norm of gradient is less than this
grtol - stop if relative norm of gradient is less than this
gttol - stop if norm of gradient is reduced by this factor

Options Database Keys

-tao_gatol <gatol> - Sets gatol
-tao_grtol <grtol> - Sets grtol
-tao_gttol <gttol> - Sets gttol

Stopping Criteria

||g(X)||                            <= gatol
||g(X)|| / |f(X)|                   <= grtol
||g(X)|| / ||g(X0)||                <= gttol

Notes

Use PETSC_DEFAULT to leave one or more tolerances unchanged.

Level: beginner

See Also

TaoGetTolerances()

Location:taosolver.c