How to read a rlp model and optmize using VS

Answered

ALESSANDRA VIEIRA

August 03, 2022 19:46

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Hi Folks,

I am using Gurobi C++ using Visual Studio and the model.write ("filename.rlp") in .cpp file. I am trying to read it in another .cpp file. I wrote in .rlp, as recommended by the Gurobi Optimization warning, which happens I guess due to the names are equal,( "vname ") + index number from a loop. Then Gurobi recognizes some names with different indexes as the same. My questions are :

should I call the model as in mip2.cpp or model.read("filename.rlp") ?

In the case of mip2.cpp, should the GRBModel have the same name as originally created ?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:31

  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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  Matthias Miltenberger

  • Gurobi Staff

  August 04, 2022 11:01

  Hi Alessandra,

  Please don't use the GRBModel::read() method to load a model from a file. Please use the respective constructor just like in the mip2_c++.cpp example:

  GRBModel model = GRBModel(*env, filename);

  If you write store the model as RLP file, all variable names will be replaced with generic names. To keep the original names, please use either the LP or better yet the MPS file format. The latter one provides more accuracy in the coefficients and preserves the order of constraints.

  If you don't assign (unique) names to all your variables and constraints, Gurobi will replace all of them with generic names.

  Best regards,
  Matthias

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