Constraints in Gurobi

Answered

Shahrzad Valizadeh

June 30, 2024 10:20

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I have the following constraint:
            model.addConstr(aux1["O+", "1", m, t] == demand - sum(i1["O+", "1", m, t] for m in range(1, m)))
            model.addConstr(aux2["O+", "1", m, t] == gp.max_(0, aux1["O+", "1", m, t]))
            model.addConstr(aux3["O+", "1", m, t] == i1["O+", "1", m, t] - aux2["O+", "1", m, t])
            model.addConstr(I1["O+", "1", m, t] == gp.max_(0, aux3["O+", "1", m, t]))

which is representative of:is there anything wrong with using auxiliary variables?

 

 

 

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:23

  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.
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  Riley Clement

  • Gurobi Staff

  June 30, 2024 23:12

  Hi Shahrzad,

  It looks correct.  You would not be able to formulate this using the current Gurobi API without using auxiliary variables.

  - Riley

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  Shahrzad Valizadeh

  June 30, 2024 23:30

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  Thank you Riley for your prompt response.

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