petsc-3.12.5 2020-03-29
DMSNESGetJacobian
get SNES Jacobian evaluation function
Synopsis
#include "petscsnes.h"
#include "petscdm.h"
PetscErrorCode DMSNESGetJacobian(DM dm,PetscErrorCode (**J)(SNES,Vec,Mat,Mat,void*),void **ctx)
Not Collective
Input Argument
dm -DM to be used with SNES
Output Arguments
| J | - Jacobian evaluation function; see SNESJacobianFunction for all calling sequence
|
| ctx | - context for residual evaluation
|
Note
SNESGetJacobian() 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 Jacobian.
See Also
DMSNESSetContext(), SNESSetFunction(), DMSNESSetJacobian(), SNESJacobianFunction
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