EPSGDSetDoubleExpansion#

Activate the double expansion variant of GD.

Synopsis#

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

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • doubleexp - the boolean flag

Options Database Key#

  • -eps_gd_double_expansion - activate the double-expansion variant of GD

Note#

In the double expansion variant the search subspace is expanded with \(K[Ax, Bx]\) instead of the classic \(Kr\), where \(K\) is the preconditioner, \(x\) the selected approximate eigenvector and \(r\) its associated residual vector. More details can be found in [Hochstenbach et al., 2012].

References#

[Hoc12]

M. Hochstenbach, E. Romero, and J. E. Roman. Davidson type subspace expansions for the linear eigenvalue problem. Technical Report STR-10, Universitat Politècnica de València, 2012. URL: https://slepc.upv.es/documentation.

See Also#

EPS: Eigenvalue Problem Solver, EPSGD, EPSGDGetDoubleExpansion()

Level#

advanced

Location#

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

Implementations#

EPSGDSetDoubleExpansion_GD() in src/eps/impls/davidson/gd/gd.c

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