GAMS World Forum

Hello guys, I'm working on a vehicle routing problem. I was able to code the model somehow and got a result. But the results are undesirable sub-tours. I want to add sub-tour elimination constraints. An example is available below: image.png I have 15 stops and that means I add this constraint for 2*...

Hi,

I solved this problem as adding the following code set.

Hello experts, I'm always opening a new toic in last days, so I apologize, but unfortunately I need to solve this GAMS problem for my doctoral thesis. I am just getting familiar with GAMS. I have a nonlinear problem and this problem also includes binary variables. The solvent used is DICOPT. I think...

Hi Steve,

Thank you very much your attention.

I want to add my output panel here as attachment. I think showing it this way will make it clearer because I don't understand exactly why the iterations are terminated. But the infeasible option seems to be correct.

Hi again Michael,

Did I say wrong which solver it is? Because the model works and does not give an error. but the result is not binary. Trying to solve it with MINLP.

So what i have to do for getting a sensible results?

I'm new to use Gams. Sorry for that, cause I can not understand completely what you mean. My solver is CONOPT (non-linear problem effect). If there is not a Gams option, how can I fix this tolerance problem? For example, I have a binary variable. And solver gives a solution as 0.8. Thats a huge rang...

Hello,

I have a mixed integer model. GAMS outputs my binary variables as decimals. For this, I guess I need to change the integrality tolerance value. But I don't know how to do it. Do you have a code?

Thank you for providing this information. I'll investigate this thread and make any required changes.

Thank you. I'll also attach my requested files to the initial post.

Hi everyone, I'm fresh over here. I want to ask my question without further ado. I am getting error 148 (even on the objective function). I've gone through almost all the related topics on the forum. I could'nt solve my problem. I am attaching my relevant files. I would be very grateful if you could...