# DESOBJ

Subcase Information Entry To select a single response definition as the objective function of an optimization, or to select system response definitions when the objective function is the least squares sum of these definitions. The DESOBJ command also indicates if this response is to be minimized or maximized.

## Format

DESOBJ (type) = integer, PROB

## Definitions

Argument Options Description
type <MIN, MAX, MINP, MAXP>
MIN (Default)
The objective is to minimize the response.
MAX
The objective is to maximize the response.
MINP
The objective is to minimize the percentile value of the response. 8
MAXP
The objective is to maximize the percentile value of the response. 8
integer <ID>

No default

ID
Identification number of a DRESP1, DRESP2, DRESP3, or DSYSID Bulk Data Entry.
PROB <Probability>

<50.0 < Real < 100.00>

Probability
Probability related to the reliability requirement. 8

4. If the DESOBJ entry is referenced by a DESOBJ Subcase entry, a least squares objective function is used in the optimization. The objective function is the sum of the squared, weighted ( $W{}_{i}$ ), normalized differences between the target responses ( ${R}_{i}^{T}$ )and those calculated by the finite element analysis ( ${R}_{i}^{\mathit{FE}}$ ).
$\text{min}{\sum _{\text{i}=1}^{\text{n}}\left({W}_{i}\frac{{R}_{i}^{\mathit{FE}}-{R}_{i}^{T}}{{R}_{i}^{T}}\right)}^{2}$