# TaoAppSetHessianMat

Sets the matrix representing the Hessian and the matrix used to precondition it.

## Synopsis

    #include "tao.h"
    int TaoAppSetHessianMat(TAO_APPLICATION taoapp, Mat H, Mat HP )

Collective on TAO_APPLICATION

## Input Parameters

| taoapp | - the TAO_APPLICATION context
| H | - the matrix used for the Hessian
| HP | - the matrix used to precondition the Hessian matrix.

## Note

Usually H and HP are the same matrix

## See Also

TaoAppSetHessianRoutine()

Level:beginner
Location:src/petsctao/application/petscapp/tao_app_fg.c
TAO Solver Index
Table of Contents

### Examples

src/bound/examples/tutorials/plate2.c.html
src/bound/examples/tutorials/jbearing2.c.html
src/bound/examples/tutorials/plate2f.F.html
src/unconstrained/examples/tutorials/eptorsion1.c.html
src/unconstrained/examples/tutorials/eptorsion2.c.html
src/unconstrained/examples/tutorials/minsurf2.c.html
src/unconstrained/examples/tutorials/rosenbrock1.c.html
src/unconstrained/examples/tutorials/eptorsion2f.F.html
src/unconstrained/examples/tutorials/rosenbrock1f.F.html