Sonja Mars
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Gurobi Staff
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Articles
Recent activity by Sonja Mars-
NoClassDefFoundError
When using the Gurobi Java API, you may see a java.lang.NoClassDefFoundError exception such as:java.lang.NoClassDefFoundError: gurobi/GRBException java.lang.NoClassDefFoundError: Could not initiali...
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ERROR 10009: License is for 8 cores, machine has xx
After installing your license file, you might receive the message:ERROR 10009: License is for 8 cores, machine has XXThis error message indicates you are trying to use the license on a machine that...
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How does IDLETIMEOUT work?
The idle timeout allows you to set a limit on how long a Compute Server or Cloud job can sit idle before the server kills the job.BackgroundBoth Gurobi Compute Server and the Instant Cloud are base...
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What is the difference between user cuts and lazy constraints?
User cuts and lazy constraints are similar but have some important differences. User cuts help tighten the relaxation of a MIP by removing fractional solutions. They are not required for the model...
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How do I resolve "ImportError: DLL load failed while importing gurobipy"?
This is only for Gurobi 9.0.1.Setup:Windows, Python 3.8.1 from http://www.python.org Situation:after running python setup.py install, importing gurobipy fails with this error from .gurobipy import ...
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grbgetkey: command not found
NOTE for WLS users: The command grbgetkey is not used with WLS licenses. Please see How do I resolve an "ERROR 202" when running grbgetkey?The grbgetkey executable is located within the full Gurobi...
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ERROR 405: Cannot reinstall license
If grbgetkey produces a message that looks like this:info : grbgetkey version 13.0.1, build v13.0.1rc0 info : Contacting Gurobi license server... error : ERROR 405: Cannot reinstall license 99999...
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Are there performance differences amongst the different Gurobi APIs?
The Gurobi APIs (Java, Python, C++, .NET, R, and MATLAB) are thin layers built on top of the C API. These APIs collect the data and pass it on to the core library, which is written in C. From a sol...
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How do I use GAMS with Gurobi?
If you have a standalone Gurobi license (free academic or commercial) and want to call Gurobi from inside GAMS, you need a Gurobi/GAMS link.You can add the paid Gurobi-Link license to your GAMS ins...
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New Documentation Site
We are happy to announce that our documentation has been moved to a new page. The page is located at docs.gurobi.com and includes our: Getting Started Pages Example Tour Reference Manual AMPL-Guro...