TaoSetTolerances#

Sets parameters used in TaoSolve() convergence tests

Synopsis#

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

Logically Collective

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 - Sets gatol
-tao_grtol - Sets grtol
-tao_gttol - Sets gttol

Stopping Criteria:

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

Notes#

Use PETSC_CURRENT to leave one or more tolerances unchanged.

Use PETSC_DETERMINE to set one or more tolerances to their values when the taoobject’s type was set

Fortran Note#

Use PETSC_CURRENT_REAL or PETSC_DETERMINE_REAL

See Also#

TAO: Optimization Solvers, Tao, TaoConvergedReason, TaoGetTolerances()

Level#

beginner

Location#

src/tao/interface/taosolver.c

Examples#

src/tao/unconstrained/tutorials/rosenbrock2.c
src/tao/constrained/tutorials/ex1.c
src/tao/unconstrained/tutorials/rosenbrock3.c
src/tao/constrained/tutorials/maros.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c

Index of all Tao routines
Table of Contents for all manual pages
Index of all manual pages