SNESQNScaleType#
the scaling type used by SNESQN
Values#
SNES_QN_SCALE_NONE
- don’t scale the problemSNES_QN_SCALE_SCALAR
- use Shanno scalingSNES_QN_SCALE_DIAGONAL
- scale with a diagonalized BFGS formula (see Gilbert and Lemarechal 1989), availableSNES_QN_SCALE_JACOBIAN
- scale by solving a linear system coming from the Jacobian you provided withSNESSetJacobian()
computed at the first iteration ofSNESQN
and at ever restart.
Options Database Key#
-snes_qn_scale_type <diagonal,none,scalar,jacobian> - Scaling type
See Also#
SNES,
SNESQN,
SNESQNSetScaleType(),
SNESQNType,
SNESQNSetType(),
SNESQNSetRestartType(),
SNESQNRestartType`
Level#
intermediate
Location#
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages