Dakota Reference Manual: contraction_factor

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contraction_factor

Amount by which step length is rescaled

## Specification

Alias: none

Argument(s): REAL

Default: 0.25

## Description

For pattern search methods, `contraction_factor` specifies the amount by which step length is rescaled after unsuccesful iterates, must be strictly between 0 and 1.

For methods that can expand the step length, the expansion is 1/ `contraction_factor`