Eli Towle
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Gurobi Staff
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Articles
Recent activity by Eli Towle-
Is Gurobi affected by the Apache Log4j security vulnerability?
Published 2021.Dec.22:Log4j is neither embedded in nor a dependency of any Gurobi product, past or present. Log4j is a software library for Java, and most of Gurobi's components are not written in ...
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How do I resolve the error "grbgetkey: command not found" or "'grbgetkey' is not recognized"?
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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Constraint has no bool value (are you trying "lb <= expr <= ub"?)
There are three primary causes of this error: Trying to add a two-sided constraint Using NumPy scalars on the left-hand side of a constraint Using variables or expressions in if-clauses Trying to a...
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How do I resolve the Cluster Manager error "Unauthorized access"?
When using the Gurobi Cluster Manager, you might receive the error "Unauthorized access". This error indicates that there is a problem with the method of authentication used to connect to the Clust...
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Error : "Problem generating unique host ID for this machine"?
You may encounter the following error when using grbgetkey to set up a license file on your machine:error : Problem generating unique host ID for this machine.For many license types (like academic ...
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How do I write an MPS model file from a third-party API?
Be careful when using a third-party API to write a model fileMany users call the Gurobi solver through third-party APIs like JuMP.jl, CVXPY, or Pyomo. Such tools may not provide a way to write an M...
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How do I suppress all console output from Gurobi?
Despite setting the OutputFlag or LogToConsole parameters to 0, Gurobi may still print license and/or compute server information to the standard output:Compute Server job ID: 11a531ac-9fd9-453d-9c6...
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How do I create a new Cluster Manager API key?
Gurobi highly recommends using an API key to authenticate with a Cluster Manager.To create a new Cluster Manager API key, navigate to the Cluster Manager web interface (for example: http://mymanage...
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How do I retrieve variable values after optimizing?
Information associated with the model or specific variables/constraints can be accessed via attributes. Variable values at the current solution are accessed via the X attribute. Note that the X att...
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How do I enable type hinting in the Gurobi Python API?
Starting with Gurobi 9.5, type hinting is available for most classes and functions in the gurobipy package.Gurobi version 11+For Gurobi versions 11.0 and later, type hints are included in the gurob...