Attributes

The primary mechanism for querying and modifying properties of a Gurobi model is through the attribute interface. A variety of different attributes are available. Some are only populated at certain times (e.g., those related to the solution of a model), while others are available at all times (e.g., the number of variables in the model). Attributes can be associated with variables (e.g., lower bounds), constraints (e.g., the right-hand side), SOSs (e.g., IIS membership), or with the model as a whole (e.g., the objective value for the current solution).

• The Attribute Types section lists all attributes, grouped by their type.

• The Attribute Examples section provides code snippets showing how to work with attributes in each language API.

• The Attribute Reference provides the full detail of each attribute’s usage and purpose.