scales
Characteristic values to scale continuous design variables
Specification
Alias: cdv_scales
Arguments: 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
