How to include negative exponent in model

Awaiting user input

Yizhi ZHEN

August 06, 2024 16:12

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Hi everyone,

Now I have a constraint of y=x^-0.5, where y and x are both decision variables. When I code the constraint as below in my model. Result shown that the model is infeasible. But when I make -0.5 becomes 0.5, the model works. If someone have ideas on how to solve this problem?

model.addGenConstrPow(x,y,-0.5)

Thanks in advanced !

Best regards

 

Related to

• General Constraints

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  Ryuta Tamura

  • Gurobi Staff

  August 07, 2024 03:52

  Hi,

  addGenConstrPow(x, y, a) should accept a=-0.5 as an argument. But there are a few things to note.

  • If the exponent a is negative, the lower bound on x must be strictly positive.
  • If the exponent isn’t an integer, the lower bound on x must be non-negative.

  You can also use computeIIS() to see why it is Infeasible. Please see: How do I determine why my model is infeasible?

  Regards,
  Ryuta

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