slepc-3.21.1 2024-04-26
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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 <lag>  - 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

src/nep/impls/narnoldi/narnoldi.c

Index of all NEP routines
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Index of all manual pages