GAMS World Forum

Short update:
I just tried to run my model again with Solver Gurobi and PoolSolutions 800.
Because of whatever reason, besides MIP status also Fixed MIP Status now says that my model has been solved to optimality.

So no further help is required

Best regards & have a nice day
Lisa

Hi Michael, hi All, At first, many thanks for your response. You are right, I have not set the optCR to zero. But in the meantime I ran my model with several test instances and scenarios where I got a further strange solver output: Extract from solver Gurobi with using PoolSearchMode 2 with PoolSolu...

Dear All, I am currently working on an MIP to minimize emissions for a vehicle routing problem. When running my model with solver Gurobi as well as with CPLEX, both solution reports show different solutions. For solver CPLEX an optimal solution is provided without any gap: Screenshot Solution Report...

Hello Gamsbart, If it is not too late and you are still working on the model, you will find my version of the CVRP below: Capacitated Vehicle Routing Problem.gms Maybe it will help you. I have managed to avoid subtours and it also gives the correct optimal solution. In case of questions, feel free t...

Hi again, Regarding my previous questions, I just wanted to let you know that I now have an appropriate model formulation of the CVRP with subtour elimination that works and provides an optimal result. The above questions are therefore no longer relevant for me personally. If anyone is interested in...

Hi again, In the meantime I have a CVRP model including a subtour elimination which might work: Capacitated Vehicle Routing Problem.gms Nevertheless, when running the model I get an error message: grafik.png Can someone help me? The questions are: Is the model correct, so that it would work if the l...

Hi, First of all I am new within the GAMS forum. As part of my master's thesis I am currently creating a GAMS model and first tried to model the CVRP. My model is based on the mathematical model formulation according to Fisher and Jaikumar (1981), where I would like to add a subtour elimination cons...