DMSNESGetNGS#
get SNES Gauss-Seidel relaxation function from a DMSNES object
Synopsis#
#include "petscsnes.h" 
#include "petscdm.h" 
PetscErrorCode DMSNESGetNGS(DM dm, PetscErrorCode (**f)(SNES, Vec, Vec, void *), void **ctx)
Not Collective
Input Parameter#
Output Parameters#
- f - relaxation function which performs Gauss-Seidel sweeps, see - SNESSetNGS()
- 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.
Developer Note#
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#
SNES: Nonlinear Solvers, DMSNES, DMSNESSetContext(), SNESGetNGS(), DMSNESGetJacobian(), DMSNESGetFunction()
Level#
developer
Location#
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages