Steven Edwards

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Activity overview

Latest activity by Steven Edwards
  • Steven Edwards created an article,

    Highlights of past Gurobi releases

    Detailed release notes are included with each of the major, minor, and technical releases. Here is a brief and non-exhaustive summary of a number of key features that were included in each of our m...

  • Steven Edwards created an article,

    How do I request a transfer of my Gurobi license?

    Some Gurobi license types work by registering the license to a specific machine. In some cases, the license is registered to a single user on that machine. For Commercial users, the Maintenance and...

  • Steven Edwards created an article,

    Error code 10009: Token validation error (status 8)

    The error ERROR 10009: Token Validation Error (status 8) typically indicates that the internal clock of the machine or container running Gurobi is out of sync with our license server. Our license s...

  • Steven Edwards commented,

    Hi Zahra. What exactly is the error that is raised when you try and add the feasibility cut?

  • Steven Edwards commented,

    Hi Johan, Apologies for the delay. It's an interesting idea. Do you mean like an automated tool for advanced user-scaling? If so, I have been playing around with an idea that could be useful for th...

  • Steven Edwards commented,

    Hi Vadim, I had a quick look and I don't believe there is a way to remove the z variables completely (I might be wrong). Given the equality constraints in    solver.addConstr(z[time_interval + 1] =...

  • Steven Edwards commented,

    Hi Vadim, Thanks for the clarification. Yes, it should be possible to express the model just in terms of the x and y variables. Well really, you only need the first of the x variables, x[0]. From x...

  • Steven Edwards commented,

    Hi Vadim, Glad to hear you resolved the issue :-). It isn't clear to me what you mean by "define z to be a dictionary and not a variable, Gurobi tells me the model is infeasible". I would encourage...

  • Steven Edwards commented,

    Official comment

    Hi Vadim, Thanks for reaching out. I tried running that code you sent through and I get a feasible solution, although slightly different from the one you mention; mine has X=3. It is not clear to m...

  • Steven Edwards commented,

    Hi Sean, Thanks for reaching out. That is quite peculiar. I notice that you are using 9.1.1 and also that a Compute Server Worker is involved. Can you first try upgrading to 9.1.2 and seeing whethe...