petsc-3.5.4 2015-05-23
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SNESQNSetScaleType

 Sets the scaling type for the inner inverse jacobian in SNESQN.

Synopsis

#include "petscsnes.h" 
PetscErrorCode SNESQNSetScaleType(SNES snes, SNESQNScaleType stype)
Logically Collective on SNES

Input Parameters

snes - the iterative context
stype - scale type

Options Database

-snes_qn_scale_type<shanno,none,linesearch,jacobian> -

SNESQNSelectTypes

SNES_QN_SCALE_NONE - don't scale the problem
SNES_QN_SCALE_SHANNO - use shanno scaling
SNES_QN_SCALE_LINESEARCH - scale based upon line search lambda
SNES_QN_SCALE_JACOBIAN - scale by inverting a previously computed Jacobian.

Keywords

SNES, SNESQN, scaling, 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