TaoSetFromOptions#

Sets various Tao parameters from the options database

Synopsis#

#include "petsctao.h" 
PetscErrorCode TaoSetFromOptions(Tao tao)

Collective

Input Parameter#

tao - the Tao solver context

Options Database Keys#

-tao_type - The algorithm that Tao uses (lmvm, nls, etc.)
-tao_gatol - absolute error tolerance for ||gradient||
-tao_grtol - relative error tolerance for ||gradient||
-tao_gttol - reduction of ||gradient|| relative to initial gradient
-tao_max_it - sets maximum number of iterations
-tao_max_funcs - sets maximum number of function evaluations
-tao_fmin - stop if function value reaches fmin
-tao_steptol - stop if trust region radius less than
-tao_trust0 - initial trust region radius
-tao_monitor - prints function value and residual norm at each iteration
-tao_smonitor - same as tao_monitor, but truncates very small values
-tao_cmonitor - prints function value, residual, and constraint norm at each iteration
-tao_view_solution - prints solution vector at each iteration
-tao_view_ls_residual - prints least-squares residual vector at each iteration
-tao_view_stepdirection - prints step direction vector at each iteration
-tao_view_gradient - prints gradient vector at each iteration
-tao_draw_solution - graphically view solution vector at each iteration
-tao_draw_step - graphically view step vector at each iteration
-tao_draw_gradient - graphically view gradient at each iteration
-tao_fd_gradient - use gradient computed with finite differences
-tao_fd_hessian - use hessian computed with finite differences
-tao_mf_hessian - use matrix-free hessian computed with finite differences
-tao_cancelmonitors - cancels all monitors (except those set with command line)
-tao_view - prints information about the Tao after solving
-tao_converged_reason - prints the reason Tao stopped iterating

Note#

To see all options, run your program with the -help option or consult the user’s manual. Should be called after TaoCreate() but before TaoSolve()