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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  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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