Ordering variables and values

Decision variables and their possible values can be ordered so that the optimizer can fix the key decision variables early in the process.

Grouping variables
Decision variables and their possible values can be ordered so that the optimizer can fix the key decision variables early in the process.
Defining a constructive strategy
A constructive strategy can be defined using search phases. A search phase specifies the criteria for the order in which variables and values are chosen in the search.
Simple variable selection
To chose decision variables, you evaluate the variables with an evaluator.
Simple value selection
To chose the value at which you fix a decision variable, you evaluate the values with an evaluator.
Multi-criteria selection
To break ties in selecting values or variables, a multi-criteria selector is needed.
Search phases with selectors
A selector can be used with a search phase to indicate which variable should be instantiated to which value.
Defining your own evaluator
CP Optimizer provides an API to define custom evaluators.
Search phases for scheduling
Search phases can be used on interval variables as well as on sequence variables.

Parent topic: Tuning the CP Optimizer search