Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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scale_types


Specify scaling for the variables

Specification

Alias: cdv_scale_types

Argument(s): STRINGLIST

Default: vector values = 'none'

Description

For continuous variables, the scale_types specification includes strings specifying the scaling type for each component of the continuous design variables vector in methods that support scaling, when scaling is enabled.

Each entry in scale_types may be selected from 'none', 'value', 'auto', or 'log', to select no, characteristic value, automatic, or logarithmic scaling, respectively. If a single string is specified it will apply to all components of the continuous design variables vector. Each entry in scales may be a user-specified nonzero real characteristic value to be used in scaling each variable component. These values are ignored for scaling type 'none', required for 'value', and optional for 'auto' and 'log'. If a single real value is specified it will apply to all components of the continuous design variables vector.

Examples

Two continuous design variables, one scaled by a value, the other log scaled,

  continuous_design = 2
    initial_point    -1.2      1.0
    lower_bounds     -2.0      0.001
    upper_bounds      2.0      2.0
    descriptors       'x1'     "x2"
    scale_types =     'value' 'log'
    scales =          4.0      0.1