Objective Function Summation Help

Answered

Richard Hoerlein

April 08, 2023 04:09

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I am a beginner to python and gurobi and am having issues creating the following objective function:

I have the following error: Unsupported type (<class 'generator'>) for LinExpr addition argument

h is a dictionary whose keys are in the list N, and the values are float

Dir is a dictionary whose keys are tuples, and the values are int

I'm having trouble finding what the generator class is. 

It's likely that my model has other issues aside from type errors and any help is appreciated

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  Riley Clement

  • Gurobi Staff

  April 10, 2023 04:11

  Hi Richard,

  You can formulate line 51 with just one gp.quicksum and one pair of parentheses.  This should eliminate the error you are seeing.

  Please be aware for future questions that you will generally get a more thorough answer and faster response if you post your code in the form of a minimum reproducible example.

  - Riley

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