Conditional Constraints if-esle on decission variable

Answered

Rahul Rahul

February 16, 2021 19:37

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Hello Gurobi developers and users

I want to implement if else-conditional constraints on following variables :

d[i,t] = a continuous non-negative variable

Y[i,t] = A binary variable

Logic I need to implement :

• if d[t] == 1 then Y[t] becomes 1
• elif 1< d[t] > 1, then Y[t] becomes 0.

"t" represents just the index of the variable.

I have been looking at several posts for conditional constraints on this form and also tried big M method, but for this particular constraint involving > and < sign, it is somehow not working.

Any help would be highly appreciated.

Thanks

Best regards,

Rahul

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 02:59 Edited

  This post is more than three 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 why not try our AI Gurobot?.
• 

  Matthias Miltenberger

  • Gurobi Staff

  February 17, 2021 08:00

  Hi Rahul,

  This condition does not make sense to me:

  elif 1 < d[t] > 1

  What do you want to express here? Is this true for all values that are not exactly 1? Tying a discrete decision onto the precise value of a continuous variable is very unusual.

  Cheers,
  Matthias

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