Values of parts of objective function

Answered

Pavithra Sreekumar

• December 10, 2021 11:38

Hello!

I am working on an optimization production planning problem, and my objective function is to minimize the total cost - for  eg 

min (production_variable * production cost) + (inventory_variable * inventory cost) for all products and timeperiods

I am able to extract the objective  value (total cost), but I am not able to get the individual parts of the cost - for eg - (inventory_variable * inventory cost) for the inventory costs 

Please do let me know how i can go about this.

Thank you in advance for your help!

Best Regards,

Pavithra 

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• 

  Jaromił Najman

  Gurobi Staff

  • December 13, 2021 11:07

  Hi Pavithra,

  The possibly easiest way to access those values is to introduce 2 auxiliary variables and the equality constraints

  aux1 = sum(production_variable * production_cost)
  aux2 = sum(inventory_variable * inventory_cost)

  and access their respective values after the optimization is completed.

  It is also possible to access the value of a LinExpr object via its getValue method. However, for this you would have to construct the linear expression of interest first.

  Best regards,
  Jaromił

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