petsc-3.7.3 2016-08-01
SNESSetNormSchedule
Sets the SNESNormSchedule used in covergence and monitoring of the SNES method.
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESSetNormSchedule(SNES snes, SNESNormSchedule normschedule)
Logically Collective on SNES
Input Parameters
| snes | - the SNES context
|
| normschedule | - the frequency of norm computation
|
Options Database Key
-snes_norm_schedule <none, always, initialonly, finalonly, initalfinalonly> -
Notes:
Only certain SNES methods support certain SNESNormSchedules. Most require evaluation
of the nonlinear function and the taking of its norm at every iteration to
even ensure convergence at all. However, methods such as custom Gauss-Seidel methods
(SNESNGS) and the like do not require the norm of the function to be computed, and therfore
may either be monitored for convergence or not. As these are often used as nonlinear
preconditioners, monitoring the norm of their error is not a useful enterprise within
their solution.
Keywords
SNES, nonlinear, set, function, norm, type
See Also
SNESGetNormSchedule(), SNESComputeFunction(), VecNorm(), SNESSetFunction(), SNESSetInitialFunction(), SNESNormSchedule
Level:developer
Location:src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages