Kostja Siefen

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Activity overview

Latest activity by Kostja Siefen
  • Kostja Siefen commented,

    Official comment

    Please take a look at our Numerical Guidelines: https://www.gurobi.com/documentation/current/refman/numerics_gurobi_guidelines.html

  • Kostja Siefen commented,

    Please create a self-contained, minimal working example and submit a ticket at https://support.gurobi.com. This way we can try to reproduce it on our end.

  • Kostja Siefen commented,

    Official comment

    Absolutely, you can implement this with a callback function.  Here is a documentation link for Python: https://www.gurobi.com/documentation/current/refman/py_callbacks.html Within the callback, you...

  • Kostja Siefen commented,

    Official comment

    The full list of status codes is documented at https://www.gurobi.com/documentation/current/refman/optimization_status_codes.html. There is nothing wrong with writing your own dictionary to convert...

  • Kostja Siefen created an article,

    "No compatible runtime available for version X.X.X" with Compute Server

    Gurobi Compute Server 8+ is able to work with multiple Gurobi releases on the client side.  The server will automatically select the appropriate runtime, depending on the version of the Gurobi Opti...

  • Kostja Siefen created an article,

    Which R versions are supported by Gurobi?

    Gurobi ships with a compiled R API package that is compatible with the latest R version at the time of the Gurobi release. You may see a warning like this if you try to use the package from a diffe...

  • Kostja Siefen created an article,

    How to handle a NoClassDefFoundError?

    You may see a java.lang.NoClassDefFoundError exception when using the Gurobi Java API. Examples: java.lang.NoClassDefFoundError: gurobi/GRBException java.lang.NoClassDefFoundError: Could not initia...

  • Kostja Siefen created an article,

    How to handle a BadImageFormatException?

    You may see a System.BadImageFormatException the first time you access the Gurobi .NET assembly. The Gurobi .NET assembly (e.g. gurobiXX.NET.dll) is compiled for AnyCPU (64-bit preferred). Your app...

  • Kostja Siefen created an article,

    Why do I see increasing/large MIP gap values?

    You may see something like this in your log file: 1503 1467 -283.00000 284 285 2160.99979 -285.00000 113% 609 127s H 1968 1870 1858.0000000 -285.00000 115% 662 1...

  • Kostja Siefen created an article,

    How do I use Gurobi with PyCharm?

    In a typical workflow each PyCharm project will have a virtual environment associated with it.  The gurobipy package must be available to the python interpreter of that venv.  Here are instructions...