Non-negative variables and -0.0 values

Answered

Ayesha Farooq

November 08, 2023 20:59

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I am trying to solve a goal programming problem. My deviation variables' (n_l, p_l) values are supposed to be non-negative integers. I even added constraints like

    for l in L:
        m.addConstr(nl[l]>= 0)
        m.addConstr(pl[l]>= 0)

but I still get -0.0 for some of the variable values while 0.0 for others. 

I can see 0.0 is valid but what does -0.0 mean and why the added constraints do not take care of it?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:35

  This post is more than two 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 try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Marika Karbstein

  • Gurobi Staff

  November 09, 2023 10:49

  Please see this post.

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