GAMS World Forum

If this is your UF1 image.png then obviously with x1 in [0,1] and xj in [-1,1] there is no chance in getting a negative value for f1 or f2. If you have negative values you probably made a mistake. Did you check the model status (for feasible solution)? It would help if you post some source. -Michael

The GAMS/IPOPT link has to map any of the IPOPT internal status (e.g. Solved To Acceptable Level ) to a combination given in the list of GAMS' model and solve status, GAMS support many solvers so all solvers need to map into the GAMS status world. Now see how the GAMS/IPOPT link maps Solved To Accep...

You should find out why IPOPT can't evaluate the input point. Some solvers don't like gradients that are too large. Usually GAMS already complains if you have a truly bad input point that can't be evaluated (at least for the function evaluation and to some extent for the gradient). IPOPT works also ...

The GAMS/IPOPT link maps this status to some combination of model and solve status, see https://www.gams.com/38/docs/UG_GamsCall.html#GAMSAOmodelstat and https://www.gams.com/38/docs/UG_GamsCall.html#GAMSAOsolvestat. You should check if this combination is any different than with the other solves an...

As all solvers SBB has a tolerance for what it considers to be integer, see https://www.gams.com/38/docs/S_SBB.html#SBBepint. The default for epint is at 1e-5. So if abs(round(x)-x)<epint x does not need to be branched on. You can change the tolerance within a solver option file.

-Michael

Either use the compact Miller, Tucker and Zemlin formulation to avoid subtours or build up only the necessary subtour elimination constraints. Both are done here: https://www.gams.com/latest/gamslib_ml/ ... _tsp5.html

-Michael

See answer here: viewtopic.php?f=2&t=12244#p29571

-Michael

NEOS does not allow you to run external programs like gdxxrw, so do the Excel to GDX conversion locally and submit gms and gdx to NEOS.

-Michael

The srep parameter always depends on the scenarios only. It gives information about the scenarios (e.g. it's probability) Why drag in set wo? So just change to Parameter s_rep(scen,*) "scenario probability" / #scen.prob 0 /; Moreover, your EMP syntax is wrong. You can either move an entire...

Eric,

I assume you run the same version of GAMS on both computers. What solver are you using? Perhaps, the end of the first scenario and the beginning of the next scenario (for both computers) might be sufficient to tell more.

-Michael