Unrecognized field name "pi"; MATLAB

Answered

Kartik Jyothi

March 15, 2024 13:02

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I want to retrieve the shadow prices of a small ILP, so I tried using pi but the same error keeps coming. What to do?

c = [2; 1];

n=2;

A=[3 2;3 1;1 2];

b=[80;50;60];

l=[0 0];

 

model.obj=c;

model.A= sparse(A);

model.rhs=b;

model.vtype=repmat('I',n,1);

model.lb=l;

model.modelsense='max';

 

results = gurobi(model);

dual=results.pi;

disp(dual)

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:28

  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

  March 15, 2024 14:50

  Please note that the Pi attribute is only available for linear programs. We discuss this in the Knowledge Base article How do I retrieve the (dual) Pi value for a MIP problem?

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