I am not getting expected results from Gurobi in Matlab!

回答済み

sina Gharebaghi

2022年07月28日 14:50

• 
• 

Hi,
I am solving a linear optimization problem in Matlab using 1-'Linprog' of Matlab, and 2-Gurobi in Matlab. All elements (Aeq, beq, A, b, ...) are identical, but results that I am getting from Gurobi are not expected. The flag in both solvers is showing that both of them are achieving the Global optimum. Could you please help me to solve this issue?
Thanks!

...

l_bound = []; u_bound = [];

% Matlab's Linprog

options = optimoptions('linprog','Algorithm','interior-point');

[x,fval,exitflag,output,lambda] = linprog(f_mat,A_ineq,b_ineq,A_eq,b_eq,l_bound,u_bound,options);

 

% Gurobi in Matlab

A = [A_ineq ; A_eq];

b = [b_ineq ; b_eq];

model.A = sparse(A);

model.obj = f_mat;

model.rhs = b;

model.vtype = 'C';

model.modelsense = 'min';

model.sense = [repmat('<',size(A_ineq,1),1) ; repmat('=',size(A_eq,1),1)]';

params = [];

% gurobi_write(model, 'model_sh.lp');

% params.Presolve = 0;

% params.outputflag = 0;

% params.Aggregate = 0;

result = gurobi(model, params);

 

 

 

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:31

  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 try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Matthias Miltenberger

  • Gurobi Staff

  2022年08月01日 10:52

  Hi Sina,

  You should write out both formulations as LP file and then compare them to each other and to the mathematical formulations they should describe.

  Best regards,
  Matthias

  0

投稿コメントは受け付けていません。