slepc-3.21.1 2024-04-26
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EPSGDSetDoubleExpansion

Activate the double expansion variant of GD.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSGDSetDoubleExpansion(EPS eps,PetscBool doubleexp)
Logically Collective

Input Parameters

eps  - the eigenproblem solver context
doubleexp  - the boolean flag

Options Database Keys

-eps_gd_double_expansion  - activate the double-expansion variant of GD

Notes

In the double expansion variant the search subspace is expanded with K*[A*x B*x] instead of the classic K*r, where K is the preconditioner, x the selected approximate eigenvector and r its associated residual vector.

See Also

EPSGDGetDoubleExpansion()

Level

advanced

Location

src/eps/impls/davidson/gd/gd.c

Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages