Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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Amount by which step length is rescaled


Alias: none

Argument(s): REAL

Default: 0.5


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