petsc-3.8.4 2018-03-24
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Returns the Jacobian matrix and optionally the user provided context for evaluating the Jacobian.


#include "petscsnes.h"  
PetscErrorCode SNESGetJacobian(SNES snes,Mat *Amat,Mat *Pmat,PetscErrorCode (**J)(SNES,Vec,Mat,Mat,void*),void **ctx)
Not Collective, but Mat object will be parallel if SNES object is

Input Parameter

snes -the nonlinear solver context

Output Parameters

Amat - location to stash (approximate) Jacobian matrix (or NULL)
Pmat - location to stash matrix used to compute the preconditioner (or NULL)
J - location to put Jacobian function (or NULL), see SNESJacobianFunction for details on its calling sequence
ctx - location to stash Jacobian ctx (or NULL)

See Also

SNESSetJacobian(), SNESComputeJacobian(), SNESJacobianFunction, SNESGetFunction()

Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages