NEPNLEIGSSetFullBasis#

Choose between TOAR-basis (default) and full-basis variants of the NLEIGS method.

Synopsis#

#include "slepcnep.h" 
PetscErrorCode NEPNLEIGSSetFullBasis(NEP nep,PetscBool fullbasis)

Logically Collective

Input Parameters#

  • nep - the nonlinear eigensolver context

  • fullbasis - true if the full-basis variant must be selected

Options Database Key#

  • -nep_nleigs_full_basis - sets the full-basis flag

Notes#

The default is to use a compact representation of the Krylov basis, that is, \(V = (I \otimes U) S\), with a BVTENSOR. This behavior can be changed so that the full basis \(V\) is explicitly stored and operated with. This variant is more expensive in terms of memory and computation, but is necessary in some cases, particularly for two-sided computations, see NEPSetTwoSided().

In the full-basis variant, the NLEIGS solver uses an EPS object to explicitly solve the linearized eigenproblem, see NEPNLEIGSGetEPS().

See Also#

NEP: Nonlinear Eigenvalue Problems, NEPNLEIGS, NEPNLEIGSGetFullBasis(), NEPNLEIGSGetEPS(), NEPSetTwoSided(), BVCreateTensor()

Level#

advanced

Location#

src/nep/impls/nleigs/nleigs.c

Examples#

src/nep/tutorials/ex42.c

Implementations#

NEPNLEIGSSetFullBasis_NLEIGS() in src/nep/impls/nleigs/nleigs.c

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