solution file and rew as input

Answered

Matthew Galati

March 03, 2024 23:33

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I want to share my solution file (warm-start) and MPS file with support. However, I want to remove col/row names. I have a .sol and .mps file that work together fine, but when I try to input .sol and .rew, it obviously can't match up the input solution. 

To generate the files I used:

            grbModel.write("test.rew");
            grbModel.write("test.mps");
            grbModel.set(GRB.StringParam.SolFiles, "test");

What is the best way to share with support an MPS file (obfuscated) and a starting solution (since by default, the solver struggles to find a first solution)?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:29

  This post is more than two 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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  Gurobot (AI-generated response)

  • Gurobi Staff

  March 04, 2024 15:52

  To share an obfuscated MPS file and a compatible warm-start solution file with Gurobi support:

  1. Obfuscate MPS File: Replace column and row names in the MPS file with generic identifiers (e.g., COL001, ROW001).

  2. Update Solution File: Modify the .sol file to match the new names in the obfuscated MPS file.

  3. Check Consistency: Ensure the obfuscated MPS and updated solution file are consistent by loading them in Gurobi.

  4. Share with Support: Send the consistent obfuscated MPS and solution files to Gurobi support, explaining the obfuscation for context.

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• 

  Ahmed Azab

  • Gurobi Staff

  March 05, 2024 02:00

  Hi Matthew,

  The following Python code can also do what you are looking for.

  import gurobipy as gp
  
  m1 = gp.read("test.mps")
  m1.read("test.sol")
  m1.params.SolutionLimit=1
  m1.optimize()
  m1.write("test.rew")
  
  m2= gp.read("test.rew")
  A = m2.getAttr("VarName", m2.getVars()) #Get variables names from rew file
  
  m1.setAttr("VarName", m1.getVars(), A) #Replace variable names in m1 with names from rew 
  m1.write("test1.sol") 

  The variables names in test1.sol should match the names in the rew file 

  I hope this can help

   

  Thanks 

  - Ahmed

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