Good afternoon, I have the following doubts

  1. Is there a command in GAMS that lets me know when my problem has multiple optimal solutions?

  2. Suppose my nonlinear optimization problem has multiple global solutions. By solving the model with GAMS I obtain a global optimal solution of that problem. The question is how to obtain a different global optimal solution without having to solve a new problem (like Magnanti-Wong for example).

Just to narrow down some ideas and attempts I made was through the magnanti Wong subproblem (https://drive.google.com/file/d/1O4gCxZQxVEvMyfx_Bh7mR3ZIuN6XDxE_/view?usp=sharing) to obtain one of those optimal global solutions different from those obtained in a classical way, however this is very difficult and I am still doing tests.


1 Answer 1


The global solver Baron can give you multiple solutions using the numsol option. For an example see: https://www.gams.com/latest/gamslib_ml/libhtml/gamslib_mhw4dxx.html.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.