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 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()

Level#

intermediate

Location#

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

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