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 - nonlinear eigenvalue solver
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 Keys#
-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#
NEPNArnoldiGetLagPreconditioner()
Level#
intermediate
Location#
Implementations#
NEPNArnoldiSetLagPreconditioner_NArnoldi() in src/nep/impls/narnoldi/narnoldi.c
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