add conditional constraint

Answered

Jin Huang

December 16, 2021 23:03

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Hi, could u please tell me how to add this kind of constraint to the optimization problem?

f(x)<=2;

Here, x=[x1,x2,x3,x4]; x1-x4 are  variables.

f(x)= x1,if x2>x4;

      =x3, if x2<=x4;

Here the value of the function f(x) is x1 or x3, while it depends on whether x2 or x4 is bigger.

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 02:42 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?.
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  Jaromił Najman

  • Gurobi Staff

  December 20, 2021 08:18

  Hi,

  You can find an example of how to formulate such an if-else-statement in the stackexchange post How to write if else statement in Linear programming?

  Best regards,
  Jaromił

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  Jin Huang

  December 20, 2021 22:03

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  Hi Jaromił,

  Really thanks for ur help. I figured it out.

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