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Dakota Reference Manual
Version 6.15
Explore and Predict with Confidence
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Amount by which step length is rescaled
Alias: none
Argument(s): REAL
Default: 0.25
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