Alexia Payan

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Recent activity by Alexia Payan Recent activity Votes
  • MIP gap

    Answered

    Hello All, I have a multi-objective 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

    Answered

    Hello, 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

    Answered

    I 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

    Answered

    Hello 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

    Answered

    Hello 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?...