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 ofSNESQNand 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