Questions about conditional statements in gurobi

Answered

Kewei Fan

December 28, 2023 08:03

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I'm a beginner and I want to know what's wrong with this code, it says: unsupported operand type(s) for ** or pow(): 'Var' and 'float', and if I delete **, it says again:  Additional sense argument provided for general constraint of indicator type

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:32

  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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  Ronald van der Velden

  • Gurobi Staff

  December 28, 2023 11:04

  • Indeed the ** operator can't be used with Gurobi variables. Consider using addGenConstrPow to define a helper variable holding YSAL_t[t]**0.624 and then use that helper variable in your indicator constraint.
  • The other error message is shown because the fourth (unnamed) argument to addGenConstrIndicator, is normally the "sense" of the constraint (e.g. <=, >=, ==). Since you include that already in the third argument, you should explicitly mention the argument name by stating name=f"RD_t_{t}_constraint". See also this question.

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  Kewei Fan

  December 29, 2023 05:21

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  Thank you very much for your answer！

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