GAMS World Forum

Hey Sergio, first: Did you force the integrality for all variables or only those which already happen to be integer in the optimal solution for the model with continuous variables? I assume the former for now. Have you tried solving your model as "relaxed MIP" by replacing "mip" ...

Hey hllsyr, there are multiple issues in the GAMS model that you have posted. The model itself is infeasible due to conflicting constraints. - It is not possible for both E1 and E2 to hold with the sets you have provided. When there are just three machines being responsible for as many as 37*96=3552...

Hey hh-student, you could set the upper bound for the transported amount x from i to j to zero for all scenarios s and goods k , if and only if there is no link a(i,j) between those two locations. The GAMS code for this is as follows: x.up(s,i,j,k)$(not a(i,j)) = 0; Kind regards, André

Hey hh-student, your model does not contain any restriction preventing setting pretty much all variables to zero (e.g. all y 's are zero thus no place is actually setup) and hence obtaining zero costs as optimal objective value. Quickly skimming over the model I was curious if maybe your equation &q...

Hey Daniel, the GAMS model you provided seems infeasible when enforcing the integrality constraints for the binary variables Y and U in your model. When relaxing the integrality constraints by replacing MIP with RMIP in the solve statement in line 149, the model becomes feasible and the optimal solu...