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 <tt>’value’</tt> and
optional for <tt>’auto’</tt> and <tt>’log’</tt>. 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