Giorgos Tsoumos
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Recent activity by Giorgos Tsoumos-
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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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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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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Constraint formulation C++
AnsweredHello, I have these formulas that i want to add to my model as constraints. The attempt so far is shown below. int customers = 100; int vehicles = 25; void visit_once_constr(GRB...
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Getting the value of a GRBVar in C++ before optimization
AnsweredHello, I have a 2d dynamically created array of GRBVar and i want to get the value in order to add a new constraint to my model before i call the model.optimize() function. Is there any way to ...
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Cannot set objective function in Gurobi model C++
AnsweredHello, I have tried to set the objective function in my model based on a quadatric expression GRBQuadExpr that i return from a function in different file other than Main.cpp. But when i run the pro...
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Error when assigning a GRBVar into a 3d dynamically array in c++
AnsweredHello, I have a problem with the assignment of a GRBVar into a 3d dynamically allocated array in C++ and i dont know why the error occures. The code is down below so // In test.cpp GRBVar*** in...