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 - 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

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

Level

intermediate

Location

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

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