Unable to read MPS file

回答済み

A.Omidi

• 2019年04月05日 21:00

Hello everybody,

 

I have a problem with reading a (.mps) file in Java API. This is Java code:

*===========================

import gurobi.*;

public class Lp2 {
public static void main(String[] args) {
try {
GRBEnv env = new GRBEnv();
GRBModel model = new GRBModel(env);

model.read("C:\\Users\\A.Omidi\\Desktop\\flow_shop.mps");
model.optimize();

int optimstatus = model.get(GRB.IntAttr.Status);
System.out.println(optimstatus);

// Dispose of model and environment
model.dispose();
env.dispose();

} catch (GRBException e) {
System.out.println("Error code: " + e.getErrorCode() + ". " + e.getMessage());
}
}
}

*===========================

While I run the code I have a error: "Error code: 10012. Can't import file 'C:\Users\A.Omidi\Desktop\flow_shop.mps' into a model".

In the other software, I don't have any problem.  Could you tell me please, is there a specific way to read (LP/MPS) file in Java?

 

Regards

Omidi. A

0

• 

  Michael Winkler

  Gurobi Staff

  • 2019年04月08日 13:01
  • 編集済み

  Hi,
  
  
  to create a Gurobi model from a file you need to pass the file name to the model
  constructor, e.g., 
  
  GRBModel model = new GRBModel(env, "C:\\Users\\A.Omidi\\Desktop\\flow_shop.mps");
  
  . See also https://www.gurobi.com/documentation/8.1/examples/load_and_solve_a_model_fro.html.
  The model.read() method can be used to read in a parameter file or attributes
  files, see also http://www.gurobi.com/documentation/8.1/refman/java_grbmodel_read.html.
  
  Best,
  Michael
  
  

   

  0
• 

  A.Omidi

  • 2019年04月08日 17:58

  

  

  

  Hi,

  Thanks so much for useful replay.

  Its work fine.

   

  Regards

  Omidi. A

  0

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