petsc-3.4.5 2014-06-29
SNESGetLagJacobian
Indicates how often the Jacobian is rebuilt. See SNESGetLagPreconditioner() to determine when the preconditioner is rebuilt
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESGetLagJacobian(SNES snes,PetscInt *lag)
Not Collective
Input Parameter
snes -the SNES context
Output Parameter
lag --1 indicates NEVER rebuild, 1 means rebuild every time the Jacobian is computed within a single nonlinear solve, 2 means every second time
the Jacobian is built etc.
Options Database Keys
-snes_lag_jacobian <lag> -
Notes:
The default is 1
The jacobian is ALWAYS built in the first iteration of a nonlinear solve unless lag is -1
Keywords
SNES, nonlinear, set, convergence, tolerances
See Also
SNESSetTrustRegionTolerance(), SNESSetLagJacobian(), SNESSetLagPreconditioner(), SNESGetLagPreconditioner()
Level:intermediate
Location:src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages