Alexia Payan
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Recent activity by Alexia Payan
MIP gap
AnsweredHello All, I have a multiobjective hierarchical optimization problem with about 450,000 variables (integer) and 355,000 constraints. After about 11 hours, the MIP gap for the first objective is 10...

Hierarchical optimization and RelTol
AnsweredHello, I am trying to maximize the revenues from building various products while minimizing the number of machines used to make those products (i.e. increase the utilization of these machines). The...

Very slow hierarchical objective optimization
AnsweredI a considering a hierarchical objective optimization. The first objective already takes a long time to "solve" to a given gap, say 3%. When adding the second objective, the runtime is increased b...

Cutoff and optimal solution
AnsweredHello All, I get the following output from my model solve: What does the current node "cutoff" objective mean? I still get an optimal solution printout after this happens with a gap of 11.1% corre...

Printing best bound solution for MIP problem
AnsweredHello All, Is it possible to print the LP solution corresponding to the best bound objective value at a given time during the optimization, for example when an integer solution to the MIP is found?...