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Getting Binding Constraints

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MEHMET RIFAT KAMBER
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  • Gurobi-versary
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Hi, I want to get tight constraints at optimality for a linear model . It is possible to check equalities of constraints, but it would be better to have a simple Gurobi function to give binding constraints. Is there a function like this or is it possible to build?

Thank you

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5 comments

Date Votes
  • Eli Towle
    • Gurobi Staff Gurobi Staff

    After optimizing, you can check if each (linear) constraint's Slack attribute is sufficiently close to \(0\). For example, in Python:

    binding = [c for c in model.getConstrs() if abs(c.Slack) < 1e-6]
    1
  • MEHMET RIFAT KAMBER
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    • Gurobi-versary
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    Thank you Mr Towle

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  • Muhammad Dzulqarnain Firdausi
    • Gurobi-versary
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    Dear Mr. Towle, when I executed the code, It thrown me an error

    AttributeError: 'ConcreteModel' object has no attribute 'getConstrs'
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  • Muhammad Dzulqarnain Firdausi
    • Gurobi-versary
    • First Comment
    • First Question

    any help for the error.

     

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  • Riley Clement
    • Gurobi Staff Gurobi Staff

    Hi Muhammed,

    It sounds like you are mixing Pyomo code with gurobipy code (we don't have a ConcreteModel object in gurobipy) which will not work.

    - Riley

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