将优先顺序赋予Gurobi / Cplex中的约束（线性编程）

Question

I am working on Business Problem for factory and developing Linear programming Solution. problem has thousands of Constraints and variables. I want to give priority sequence to constraints so that constraints which are lower in priority can be breached if no optimum solution.

My Question is how to Set the constraint priority sequnece for CPLEX/Gurobi Solver.I am using java as language ,Do we have any specific format/function etc?

Answer 1

This is usually done at the modeling level. Add slacks to the equations, and add a term to the objective that minimizes the slack using a penalty or cost coefficient. Sometimes you can even use some dollar figures for the cost (eg storage capacity constraint: then cost is something like the price of renting extra storage space). This process is sometimes called making the model elastic, or introducing hard and soft constraints and is quite often used in practical models.