TaoSetTolerances#

Sets parameters used in Tao 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_DEFAULT to leave one or more tolerances unchanged.

See Also#

TaoGetTolerances()

Level#

beginner

Location#

src/tao/interface/taosolver.c

Examples#

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


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