# DAAppSetJacobianRoutine

Set a routine that will evaluate the Jacobian on the given DA at the given point.

## Synopsis

    #include "taodaapplication.h"
    int DAAppSetJacobianRoutine(TAO_APPLICATION daapplication, int (*jac)(TAO_APPLICATION,DA,Vec,Mat,void*),void *ctx)

Collective on TAO_APPLICATION

## Input Parameters

| daapplication | - the DA Application object
| jac | - the function pointer for the Jacobian evaluation routine
| ctx | - the jacobian context

## Calling sequence of hess

        jac(TAO_APPLICATION daapplication, DA da, Vec x,Mat J,void *ctx);

| daapplication | - the TAO_APPLICATION context
| da | - the Distributed Array
| x | - input vector
| J | - Jacobian matrix
| ctx | - user-defined hessian context set from DAAppSetHessianRoutine()

## Options Database Key

-tao_view_jacobian -view the jacobian after each evaluation using PETSC_VIEWER_STDOUT_WORLD

## Keywords

DA, hessian

## See Also

DAAppSetConstraintRoutine();

Level:intermediate
Location:src/petsctao/gridapplication/interface/daapp.c
TAO DA Application Index
Table of Contents