Migrating from CPLEX to Gurobi

Answered

Masoud Kavoosi

February 07, 2022 21:53

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Hi there,

I have a code, which solves the model by CPLEX. I am trying to make necessary changes to solve the model by Gurobi other than CPLEX. However, I do not know what is the Gurobi equivalent of IloCplex. What do I have to write other than 

IloCplex* cplex;

Thanks

Masoud

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:44

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
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  Maliheh Aramon

  • Gurobi Staff

  February 08, 2022 05:14

  Hi Masoud, 

   

  To solve an optimization problem with CPLEX C++ API, we typically follow the steps below:

  # Create an environment
  IloEnv env;
  # Create an empty model
  IloModel model(env);
  ...
  # Create a solver object
  IloCplex cplex(model);
  # Optimize
  cplex.solve()

  In Gurobi C++ API, we follow similar steps with one difference where there is no need to create a solver object. The optimize() method is directly called on the model object.

  # Create an environment and start it
  GRBEnv env = GRBEnv(true);
  env.start();
  # Create an empty model
  GRBModel model = GRBModel(env);
  ...
  # Optimize
  model.optimize()

  Best regards,

  Maliheh

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  Masoud Kavoosi

  February 08, 2022 13:41

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  Thank you, Maliheh!

  Your explanation clears up everything for me.

  Regards!

  Masoud

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