Writing a .lp file

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Dhruv Jani

2023年12月03日 23:03 編集済み

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Hi,

 

I am trying to read and optimize a .lp file using gurobi. Here's my .lp file:

--------------------------------------------------------

\ Model powerloss
\ LP format - for model browsing. Use MPS format to capture full model detail.
Minimize
   [ x ^ 2 +  4 y ^ 2 +  6 z ^ 2 +  12 w ^ 2 +  3 v ^ 2 ]

Subject to
  c0: x + y = 710
  c1: x -z -w = 0
  c2: y + z - v = 0
  c3: w + v = 710
Bounds

End

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So, when I try to run this in python using gurobi and some code, it says the following:

Can you please help me with this?

 

Unable to open file 'C:\Users\user\OneDrive\Documents\powerloss.lp' for input
An error occurred: Unable to read model

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• Model Files

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:33

  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.
• 

  Simranjit Kaur

  • Gurobi Staff

  2023年12月03日 23:32 編集済み

  Hi Dhruv,

  Your LP file is in the correct format.  One way to check this is to navigate to the location of your LP file and run the following commands with Python:

  import gurobipy as gp
  model = gp.read("powerloss.lp")

  It seems the error is due to your code not being able to locate/open the LP file. Please ensure your code can access the file.

  Best regards,
  Simran

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