petsc-3.4.5 2014-06-29

SNESQNSetRestartType

 Sets the restart type for SNESQN.

Synopsis

#include "petscsnes.h" 
PetscErrorCode SNESQNSetRestartType(SNES snes, SNESQNRestartType rtype)
Logically Collective on SNES

Input Parameters

snes - the iterative context
rtype - restart type

Options Database

-snes_qn_restart_type<powell,periodic,none> - set the restart type
-snes_qn_restart[10] - sets the number of iterations before restart for periodic

SNESQNRestartTypes

SNES_QN_RESTART_NONE - never restart
SNES_QN_RESTART_POWELL - restart based upon descent criteria
SNES_QN_RESTART_PERIODIC - restart after a fixed number of iterations

Notes

The default line search used is the L2 line search and it requires two additional function evaluations.

Keywords

SNES, SNESQN, restart, type, set SNESLineSearch

Level:intermediate
Location:src/snes/impls/qn/qn.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages