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 set using
the ObjNumber parameter.
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 most ObjNRelTol*
.
Objective degradations are handled differently for multi-objective LP models. The allowable degradation is controlled strictly using the ObjNAbsTol.
The default relative tolerance for an objective is 0.
The number of objectives in the model can be queried (or modified) using the NumObj attribute.
Please refer to the discussion of Multiple Objectives for more information on the use of alternative objectives.
For examples of how to query or modify attributes, refer to our Attribute Examples.
