Michael Winkler

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Recent activity by Michael Winkler Recent activity Votes
  • Official comment

    Hi Abbas,   you can change the type of a variable with by settings it's variable type attribute. E.g., start[0][0].set(GRB.CharAttr.VType, GRB.CONTINUOUS).   Best, Michael

  • Official comment

    Hi Ritesh,   you cannot directly model constraints conditionally on the result of another constraint. Lets assume that you want to minimize your Cost. Then what you could do is add constraints for ...

  • Official comment

    Sadly it is currently not possible to "just" reject solutions. I guess by adding so many lazy constraints the LP becomes hard?! Do you know if a valid solution exists, i.e., one you would not cut o...

  • Official comment

    Dear Stefan,   what bounds do you get when you manually branch on a variable (do you have special knowledge which variable will have a big impact on moving the dual bound or does it not really matt...

  • Hi,    I'm not sure how your sets I and J are defined but my current guess is that they start from 0. Then I'm also not sure how your x (variables) are defined. I guess that trying to access x[i-1,...

  • Hi,to create a Gurobi model from a file you need to pass the file name to the modelconstructor, e.g., GRBModel model = new GRBModel(env, "C:\\Users\\A.Omidi\\Desktop\\flow_shop.mps"); . See also ht...