Giorgos Tsoumos
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Activity overview
Latest activity by Giorgos Tsoumos-
Giorgos Tsoumos created a post,
Model not solving all instances
AnsweredHello, I have a problem with my model, while it solves some instances of solomons 56 PDPTW like lc101,lc105 etc. some others like lc102,lc103 etc is incapable of solving it and it runs for hours w...
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Giorgos Tsoumos created a post,
Error 10003 Invalid arguments in callback function
Awaiting user inputHello, I am trying to get the values of the GRBVariables inside the callback function of a user-defined class inherited from GRBCallback. However when i run getSolution() or setSolution the error ...
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Giorgos Tsoumos created a post,
Dual Simplex Stucks when Barrier solves the model in C++
AnsweredHello, I have formulate the CVRPTW problem which is solved by the barrier algorithm but when the dual simplex method crossover comes to optimize the solution it stucks forever showing me logs... A...
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Giorgos Tsoumos commented,
Very well thank you for your time!
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Giorgos Tsoumos commented,
Good morning, I have changed the name of variables and found the error in constraints however now the model while computing the solution "stucks" here as the screenshot shows and i don't know why? ...
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Giorgos Tsoumos commented,
\ Model (null)_copy\ LP format - for model browsing. Use MPS format to capture full model detail.Minimize Subject To R0: x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x ...
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Giorgos Tsoumos commented,
Hello, I have added the variables arrive and depart as GRBVars and also i have i have looked at the example Technician Routing Problem. I've also run the formulation with only 3 constraints but ...
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Giorgos Tsoumos commented,
Do i have to add them as Gurobi variables? I am asking because i have to add the constraint 8 which involves xijk which is a gurobi variable but apart from depart[i] and arrival[i] are not. Yes ...
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Giorgos Tsoumos commented,
Hello, I have written the model in a file with extension .lp and i've tried to reduce the problem's complexity to a smaller one but i still cannot find the infeasibility reason... depart[i] and ar...
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Giorgos Tsoumos commented,
Hello, Well, the debugging process terminates but the model is infeasible and i dont know why. I guess it's something to do with the constraints but i cannot find it. I have added the constraints a...