set the value of unused variables

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Amir Ghiasi Noughaby

2021年05月10日 06:26

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Hi, 

In my model, there are some unused binary variables. I want to set the default value of them zero rather than one. How can I do this?

 

Thanks  

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:55 編集済み

  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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  Silke Horn

  • Gurobi Staff

  2021年05月10日 08:13

  Hi,

  In Gurobi, variables don't have a default value. If there are multiple optimal solutions (for example by choosing different values for variables that do not participate in any constraint or the objective), Gurobi will return the first one it finds -- which one this is may depend on the solver path.

  If you want "unused variables" to be zero, you could simply add a constraint that fixes them to zero or you could add them to your objective function with the appropriate sign (depending on whether you're maximizing or minimizing).

  Silke

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