petsc-master 2020-11-25
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MatLMVMSymBroydenSetScaleType

Sets the scale type for symmetric Broyden-type updates.

Synopsis

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

Input Parameters

snes - the iterative context
rtype - restart type

Options Database

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

MatLMVMSymBrdnScaleTypes

MAT_LMVM_SYMBROYDEN_SCALE_NONE - initial Hessian is the identity matrix
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

See Also

MATLMVMSYMBROYDEN, MatCreateLMVMSymBroyden()

Level

intermediate

Location

src/ksp/ksp/utils/lmvm/symbrdn/symbrdn.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages