Hi, my name is Eri. Right now I’m in my second year of master degree in chemical engineering. I’m using GAMS as a part in my thesis (big part actualy), since my work is very closely related with optimization. I have question about setting boundary.

My objective value (let say it’s A) is about 0.8-0.9 (estimation), and I put safe upper bound (A.up), let say it’s 5. Oddly, the result can be a different value (not 0.8/0.9/in between but a very small number). if I raise the upper bound to a bigger value (for example, 10), the result is normal (in 0.8-0.9 range).

The question is, is it good to have a very narrow range between lower and upper boundary, or is it normal to have odd result if the range is too narrow (hence, we have to have a wider range in order to give GAMS some kind of “space” to converge?).

my problem is minimization, and I am using baron solver (MINLP). Thanks in advance.

PS: I’m sorry for my English since it is not my first language ;D

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