petsc-3.7.5 2017-01-01
DMSNESGetNGS
get SNES Gauss-Seidel relaxation function
Synopsis
#include "petscsnes.h"
#include "petscdm.h"
PetscErrorCode DMSNESGetNGS(DM dm,PetscErrorCode (**f)(SNES,Vec,Vec,void*),void **ctx)
Not Collective
Input Argument
dm -DM to be used with SNES
Output Arguments
| f | - relaxation function which performs Gauss-Seidel sweeps, see SNESGSFunction
|
| ctx | - context for residual evaluation
|
Note
SNESGetNGS() is normally used, but it calls this function internally because the user context is actually
associated with the DM. This makes the interface consistent regardless of whether the user interacts with a DM or
not. If DM took a more central role at some later date, this could become the primary method of setting the residual.
See Also
DMSNESSetContext(), SNESGetNGS(), DMSNESGetJacobian(), DMSNESGetFunction(), SNESNGSFunction
Level:advanced
Location:src/snes/utils/dmsnes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages