Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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Select a mutation type for JEGA methods


Alias: none

Argument(s): none

Default: replace_uniform

Required/Optional Description of Group Dakota Keyword Dakota Keyword Description
(Choose One)
Group 1 bit_random Mutate by flipping a random bit
replace_uniform Use uniformly distributed value over range of parameter
offset_normal Set mutation offset to use a normal distribution
offset_cauchy Use a Cauchy distribution for the mutation offset
offset_uniform Set mutation offset to use a uniform distribution
Optional mutation_rate Set probability of a mutation


Five mutation types are available for selection by keyword: replace_uniform, bit_random, offset_cauchy, offset_normal, and offset_uniform. They are described in greater detail on their respective keyword pages.

The offset_* mutators all act by adding a random "offset" to a variable value. The random amount has a mean of zero in all cases. The size of the offset is controlled using the mutation_scale keyword, which is interpreted differently for each offset_* type.

The rate of mutations for all types is controlled suing the mutation_rate. The rate is applied differently in each mutation_type.