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# TaoBRGNSetRegularizerHessianRoutine

Sets the user-defined regularizer call-back function into the algorithm.

## Synopsis

    #include "petsctao.h"
    PetscErrorCode TaoBRGNSetRegularizerHessianRoutine(Tao tao, Mat Hreg, PetscErrorCode (*func)(Tao tao, Vec u, Mat Hreg, void *ctx), void *ctx)

## Input Parameters

- tao - the `Tao` context

- Hreg - user-created matrix for the Hessian of the regularization term

- func - function pointer for the regularizer Hessian evaluation

- ctx - user context for the regularizer Hessian

## Calling sequence

- tao - the `Tao` context

- u - the location at which to compute the Hessian

- Hreg - user-created matrix for the Hessian of the regularization term

- ctx - user context for the regularizer Hessian

## See Also

`Tao`, `Mat`, `TAOBRGN`

## Level

advanced

## Location

src/tao/leastsquares/impls/brgn/brgn.c

## Examples

src/tao/leastsquares/tutorials/tomography.c

## Implementations

TaoBRGNSetRegularizerHessianRoutine_BRGN(Tao tao, Mat Hreg, PetscErrorCode (*func)() in src/tao/leastsquares/impls/brgn/brgn.c

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