Can get the value of LinExpr for dictionary type?

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bert li

• 2019年05月13日 11:28

I used a binary variable to formulate a linear expression，and I want get the value of the linear expression and assign to a dictionary  because I want to print it for check the codes. Then,I used the linear expression to formulate a quadratic expression.I want get the value of it and assign to a dictionary too.Thanks a lot !

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• 正式なコメント

  

  Simranjit Kaur

  Gurobi Staff

  • 2024年12月06日 00:59

  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 why not try our AI Gurobot?.
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  Silke Horn

  Gurobi Staff

  • 2019年05月13日 12:21

  Could you give us some more information about what exactly you are trying to do and what you need help with? Do you need help getting the values? (Both LinExpr and QuadExpr have a getValue method.) What are the keys of your dictionary?

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  bert li

  • 2019年05月13日 12:53

  

  

  

  

  I have tried to use getValue method , but I can't get the value

   

   

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  Silke Horn

  Gurobi Staff

  • 2019年05月14日 06:55

  Which are the expressions for which you want to get the values?

  Please note that you are using the variable name s twice (in the outer loop and in the loop inside quicksum) while i will be undefined. Maybe the inner loop should be over i instead?

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  bert li

  • 2019年05月14日 07:43

  

  

  

  I‘m sorry.It's my mistake.

  

  And I want to get the value of A[s].If I print it directly,I get a expression involve parameter like this.

  

  This expression is not my objective function.And I don't know the method that document given us how to use. So I can't get the value of the expression. Thank you for your patient.

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  Silke Horn

  Gurobi Staff

  • 2019年05月14日 08:26

  You can call getValue on the A[s]. E.g.

  for s in range(2):

      print(A[s].getValue())

   

  Note though that you first need a solution for this. I.e., you should first call optimize on your model.

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  bert li

  • 2019年05月14日 08:48

  

  

  

  I have optimized the model and used your method.But the result like this.

  

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  Silke Horn

  Gurobi Staff

  • 2019年05月14日 13:31

  Could you please show a complete code sample?

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  bert li

  • 2019年05月22日 08:34

  

  

  

  Thanks a lot, I have solved it .

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