NEPNArnoldiSetLagPreconditioner#

Determines when the preconditioner is rebuilt in the nonlinear solve.

Synopsis#

#include "slepcnep.h" 
PetscErrorCode NEPNArnoldiSetLagPreconditioner(NEP nep,PetscInt lag)

Logically Collective

Input Parameters#

  • nep - the nonlinear eigensolver context

  • lag - 0 indicates NEVER rebuild, 1 means rebuild every time the Jacobian is computed within the nonlinear iteration, 2 means every second time the Jacobian is built, etc.

Options Database Key#

  • -nep_narnoldi_lag_preconditioner - the lag value

Notes#

The default is 1. The preconditioner is ALWAYS built in the first iteration of a nonlinear solve.

See Also#

NEP: Nonlinear Eigenvalue Problems, NEPNArnoldiGetLagPreconditioner()

Level#

intermediate

Location#

src/nep/impls/narnoldi/narnoldi.c

Implementations#

NEPNArnoldiSetLagPreconditioner_NArnoldi() in src/nep/impls/narnoldi/narnoldi.c

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