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 - Taocontext
- 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#
Examples#
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/tao/constrained/tutorials/ex1.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/rosenbrock2.c
src/tao/unconstrained/tutorials/rosenbrock3.c
src/tao/constrained/tutorials/maros.c
Index of all Tao routines
Table of Contents for all manual pages
Index of all manual pages