How to scale each continuous design variable


  • Alias: cdv_scale_types

  • Arguments: STRINGLIST

  • Default: vector values = ‘none’


Each string in scale_types indicates the scaling type for each continuous design variable. They only have effect when the associated method specifies scaling.

The options are:

  • <tt>’value’</tt> - characteristic value by which variables will be divided. If this is chosen, then scales must also be specified; ‘value’ is assumed if scales are given without scale_types

  • <tt>’auto’</tt> - automatic scaling based on bounds.

  • <tt>’log’</tt> - logarithmic scaling (can be used together with scales).

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

Usage Tips:

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


Two continuous design variables, one scaled by 4.0, the other by 0.1, then further 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