Dakota Reference Manual: scales

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scales

Characteristic values to scale continuous design variables

## Specification

Alias: cdv_scales

Argument(s): REALLIST

Default: vector values = 1 . (no scaling)

## Description

Each real value in `scales` is a nonzero characteristic value to be used in scaling each continuous design variable. They only have effect when the associated method specifies `scaling`.

This keyword is required for scale_types of `'value'` and optional for `'auto'` and `'log'`. When specified in conjunction with log, scale values are applied prior to the logarithm, to permit log scaling of strictly negative design variables.

If a single real value is specified it will apply to all continuous design variables. Otherwise, a scale value must be specified for each continuous design variable.

Usage Tips:

When `scales` are specified, but not scale_types, the scaling type is assumed to be 'value' for all continuous design variables.

Use scale values of 1.0 to selectively avoid scaling a subset of the variables.

Scaling for linear constraints is applied after any continuous variable scaling.

See the scaling information under specific methods, e.g., `method-*-scaling` for details on how to use this keyword.

## Examples

Two continuous design variables, one scaled by the characteristic value 4.0, the other log-scaled without additional value scaling

      continuous_design = 2
        initial_point    -1.2      1.0
        lower_bounds     -200      0.001
        upper_bounds      200      2.0
        descriptors       'x1'     "x2"
        scale_types = 'value' 'log'
        scales = 4.0 1.0