MatLMVMSymBroydenSetScaleType#

Sets the scale type for symmetric Broyden-type updates.

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatLMVMSymBroydenSetScaleType(Mat B, MatLMVMSymBroydenScaleType stype)

Input Parameters#

B - the MATLMVM matrix
stype - scale type, see MatLMVMSymBroydenScaleType

Options Database Key#

-mat_lmvm_scale_type <none,scalar,diagonal> - set the scaling type

MatLMVMSymBrdnScaleTypes:

MAT_LMVM_SYMBROYDEN_SCALE_NONE - use whatever initial Hessian is already there (will be the identity if the user does nothing)
MAT_LMVM_SYMBROYDEN_SCALE_SCALAR - use the Shanno scalar as the initial Hessian
MAT_LMVM_SYMBROYDEN_SCALE_DIAGONAL - use a diagonalized BFGS update as the initial Hessian
MAT_LMVM_SYMBROYDEN_SCALE_USER - same as MAT_LMVM_SYMBROYDEN_NONE
MAT_LMVM_SYMBROYDEN_SCALE_DECIDE - let PETSc decide

See Also#

KSP: Linear System Solvers, MATLMVMSYMBROYDEN, MatCreateLMVMSymBroyden(), MatLMVMSymBroydenScaleType

Level#

intermediate

Location#

src/ksp/ksp/utils/lmvm/symbrdn/symbrdn.c

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