slepc-3.18.0 2022-10-01
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NEPRIISetLagPreconditioner

Determines when the preconditioner is rebuilt in the nonlinear solve.

Synopsis

#include "slepcnep.h" 
PetscErrorCode NEPRIISetLagPreconditioner(NEP nep,PetscInt lag)
Logically Collective on nep

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_rii_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

NEPRIIGetLagPreconditioner()

Level

intermediate

Location

src/nep/impls/rii/rii.c

Examples

src/nep/tutorials/ex21.c.html
src/nep/tutorials/ex22.c.html
src/nep/tutorials/ex22f90.F90.html


Index of all NEP routines
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Index of all manual pages