scale_types

How to scale each nonlinear constraint

Specification

  • Alias: nonlinear_equality_scale_types

  • Arguments: STRINGLIST

  • Default: no scaling

Description

Each string in scale_types indicates the scaling type for each nonlinear inequality (equality) constraint. They only have effect when the associated method specifies scaling.

The options are:

  • value - characteristic value by which nonlinear constraint values will be divided. If this is chosen, then scales must also be specified; ‘value’ is assumed if scales are given without scale_types

  • auto - automatic scaling based on bounds (inequalities) or targets (equalities)

  • log - logarithmic scaling (can be used together with scales, which can be helpfully used to negate values prior to log transformation)

If a single string is specified it will apply to all of the nonlinear inequality (equality) constraints. Otherwise a string must be specified for each nonlinear inequality (equality) constraint.

Usage Tips:

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