Delivery and pickup problem
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Hi, I am working on a pick up and delivery problem using Gurobi solver. As we have added all the constraints, the program should work but the problem is that each vehicle should travel one route starting and ending at the depot. The vehicle does this but there are several pickup/delivery points that are not included in the route. There are multiple routes that do not start or end at the depot and they are not included in the route per vehicle. We are not sure how to fix the problem, if needed I can send a screenshot of the output and the code.
Thank you in advance!
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Gurobi Staff
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Perhaps you could try fixing the missing delivery/pickup points in the route and forcing the routes to start/end at the depot. Then solve to see if the model remains feasible.
If the model turns out to be infeasible, you can use the tools described in the following links to see which constraint may be causing the issue: Diagnose and cope with infeasibility and How do I determine why my model is infeasible?
If the model is still feasible, we can dig a bit deeper. It would help if you can provide the math model, code, and some more detail on which variables are giving the unexpected results.
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