Gwyneth Butera
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Gurobi Staff
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Articles
Recent activity by Gwyneth Butera-
Does the barrier algorithm return a basic solution for LPs?
With default parameters, the barrier algorithm will return a basic solution for linear programs. However, if you set the Crossover parameter to 0, then it will not.What is Crossover?Crossover is an...
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What system changes can invalidate a license file?
Errors such as: ERROR 10009: HostID mismatch ERROR 10009: License is for 8 cores, machine has XX indicate that the license file was generated for a machine with a different host ID, different core ...
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How do I resolve the error 'User account type is not academic'?
If you receive the error "[USER_NOT_ACADEMIC] User account type is not academic", you are currently registered as a Commercial User.To update your account, please update your account information in...
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How does log rotation work with Gurobi Compute Server?
Two grb_rs.cnf configuration properties control the rotation of log files: LOGFILE_MAX_SIZE is the maximum size in megabytes of the log file before it gets rotated. The default is 500 megabytes. ...
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Does using more threads make Gurobi faster?
Continuous models (LP, QP, SOCP)When solving continuous models with the barrier algorithm (Method = 2), the matrix operation (ordering and factorization) is faster with more threads. However, more ...
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How do I resolve the error "Communication failed" when running grbgetkey?
While running grbgetkey to retrieve a license file, you might receive the error:Communication failed, check your network connection or set variable HTTPS_PROXY if you need a proxyIf your computer i...
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How do I install Gurobi for Matlab?
To begin, you'll need to tell MATLAB where to find the Gurobi routines. We've provided a script to assist you with this. The Gurobi MATLAB setup script, gurobi_setup.m, can be found in the <install...
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How do I resolve the error "No key code entered"?
The interactive shell was removed entirely in version 13, which was released in November 2025.When launching the Gurobi Interactive shell via gurobi.sh or a shortcut to gurobi.bat, you will be prom...
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How do I request a free academic AMPL license for use with Gurobi?
Beginning with Gurobi version 12.0, academic AMPL licenses for use with Gurobi are administered by AMPL through the extended AMPL Community Edition for Academics. Please refer to AMPL in Academia f...
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How do I request a license for an older version of Gurobi?
Gurobi licenses are backwards compatible, meaning you can use them to run versions of Gurobi older than the licensed version.Regardless of which Gurobi version is being used, Gurobi needs to know w...