**petsc-3.11.4 2019-09-28**

# TaoSetUpdate

Sets the general-purpose update function called at the beginning of every iteration of the nonlinear solve. Specifically it is called at the top of every iteration, after the new solution and the gradient is determined, but before the Hessian is computed (if applicable).
### Synopsis

#include "petsctao.h"
PetscErrorCode TaoSetUpdate(Tao tao, PetscErrorCode (*func)(Tao, PetscInt,void*), void *ctx)

Logically Collective on Tao

### Input Parameters

**tao ** -The tao solver context

**func ** -The function

### Calling sequence of func

**func (Tao tao, PetscInt step);** -

**step ** -The current step of the iteration

### Keywords

Tao, update

### See Also

TaoSolve()

### Level

advanced

### Location

src/tao/interface/taosolver.c

Index of all Tao routines

Table of Contents for all manual pages

Index of all manual pages