Chou Chun_Yen

Thanks you so much Jaromił Najman I solve the problem! 

Jaromił Najman Omg thank you very much, I did not notice this detail, I have another question, I revise quantity discount cost to [20,20,10,10,5,5], as the code below, but the model becomes infeasi...

  Thank you for your reply Jaromił Najman But my shipping cost variable art _cost variable depends on the number of shipments, so I should not be able to fix my cost variable, I am referring to the...

Thank you for your reply Jaromił NajmanI'm not sure what the log file is, so I searched online for the log file of gurobi, and my log file should be as follows Restricted license - for non-producti...

HelloI'm not a native English speaker, please forgive meCan you please tell me how to write the objective function of  piecewise-linear function in gurobi for this question Best regards