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 tensor BV. This behaviour 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#

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

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