Hi

I have an MINLP problem and the GAMS (BARON)'s model status for this problem is integer solution. I have set the lower bound and upper bound for my variables.

Does â€œinteger solutionâ€ mean that it is not the optimal solution?

Best Regards

Sanaz

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Hi Sanaz,

I think it means the solver obtained an integer solution which the solver recognized as optimal integer solution. You can check the solution to see whether it is feasible for the model. Sometimes, optimal integer solution is, though usually it is not, the optimal solution of the relaxed model. Furthermore, if your model is convex and the objective is to find minimal solution, the optimal solution must be the global optimal solution, and vise versa.

Regards,

Dylan

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Hi

I have an MINLP problem and the GAMS (BARON)'s model status for this problem is integer solution. I have set the lower bound and upper bound for my variables.

Does â€œinteger solutionâ€ mean that it is not the optimal solution?

Best Regards

Sanaz

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Hi Dylan,

Thank you very much indeed for your answer.

Actually, I have run my model for 30 examples (30 different sets of parameters). For some of the examples, the model status is infeasible, for some of them it is optimal and for the others it is integer solution. Moreover, I have chosen BARON (which is a global optimizer) as the solver.

If it is not the optimal solution, does it mean that the function is not concave (it is a maximization problem) for those examples with integer solution and BARON acts a heuristic method to find the best solution (not the optimal)?

Is there any way to determine whether the function is concave or not?

Best Regards

Sanaz

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Hi friends

What is the difference between integer solution and optimal in Baron?

Best Regards

Sanaz

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