ObjNRelTol
| Type: | double |
|---|---|
| Modifiable: | Yes |
This attribute is used to set the allowable degradation for objective
when doing hierarchical multi-objective optimization for MIP models. You setusing theObjNumberparameter.
Hierarchical multi-objective MIP optimization will optimize for the different objectives in the model one at a time, in priority order. If it achieves objective value
when it optimizes for this objective, then subsequent steps are allowed to degrade this value by at mostObjNRelTol*
.
Objective degradations are handled differently for multi-objective LP models. The allowable degradation is controlled strictly using theObjNAbsTol.
The default relative tolerance for an objective is 0.
The number of objectives in the model can be queried (or modified) using theNumObjattribute.
Please refer to the discussion ofMultiple Objectivesfor more information on the use of alternative objectives.
For examples of how to query or modify attributes, refer to ourAttribute Examples.
