Dakota Reference Manual: id_quasi_hessians

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id_quasi_hessians

Identify which quasi-Hessian corresponds to which response

## Topics

This keyword is related to the topics:

- objective_function_pointer

## Specification

Alias: none

Argument(s): INTEGERLIST

Child Keywords:

| Required/Optional | Description of Group | Dakota Keyword | Dakota Keyword Description
--- | --- | --- | --- | ---
| Required (Choose One) | Quasi-Hessian Approximation (Group 1) | bfgs | Use BFGS method to compute quasi-hessians
sr1 | Use the Symmetric Rank 1 update method to compute quasi-Hessians

## Description

The `id_analytic_hessians` list specifies by number the functions which have analytic Hessians, and the `id_numerical_hessians` and `id_quasi_hessians` lists specify by number the functions which must use numerical Hessians and secant Hessian updates, respectively. Each function identifier, from 1 through the total number of functions, must appear once and only once within the union of the `id_analytic_hessians`, `id_numerical_hessians`, and `id_quasi_hessians` lists.

## See Also

These keywords may also be of interest:

- id_numerical_hessians
- id_analytic_hessians