Maura Nurinda
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Activity overview
Latest activity by Maura Nurinda-
Maura Nurinda created a post,
Arrival Time VRPTW Need Help
AnsweredHi I'm am working on my undergraduate thesis on multi period VRP with time windows in collection pickup scheduling and routing. My code work well unless the decision variable start time of pickup i...
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Maura Nurinda created a post,
Multi-period VRP Inventory stuck
AnsweredHi Gurobi Team, I am working on my undergraduate thesis on multi period VRP in collection scheduling and routing. The inventory will be the fundamental point to trigger the multiperiod method. I wa...
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Maura Nurinda commented,
Ah i see, i think that's the error comes from. So I have set of n indexed with j. The length is 6, with 0 is depot and 1-5 is the node that needs to be visited. Since generally we use lots of 1-5 d...
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Maura Nurinda commented,
Yes, it shows the schedule for that nodes and vehicle in specific timing period. If it's giving y[i,j,k] = 1, it means that vehicle i is visiting node j in period k. Hence, the variable 'e' shows t...
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Maura Nurinda commented,
Hi Riley, noted. Thank you very much for your help on this, I can understand where the error within my code. After giving several revisions, the code looks like this. I also put several constraint ...
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Maura Nurinda commented,
Hi Riley, If it's like that, so what's the '.X' define in the code? Also, the constraint that you created previously for decision variable "e" is not creating the boundaries that need to be fulfil...
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Maura Nurinda commented,
Hi Riley, Thank you for your help, after changing the pickup-produce constraint as you suggested, the model is not infeasible anymore. But I still have this difficulty in the attribute e error. Co...
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Maura Nurinda commented,
For giving more context, In the pickup-produce constraint, I would like to create a scenario where everytime the vehicles visit that node in specific time (node can only be visited once for all per...
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Maura Nurinda commented,
Hi Riley, Thank you for the heads up! Yes you are right, I did some mistake while writing the inventory constraints. After giving revision of it, it still giving infeasible result and showing this ...
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Maura Nurinda created a post,
Mult-period VRP Inventory stuck in creating the syntax
OngoingHi Gurobi Team, I am working on my undergraduate thesis on multi period VRP in collection scheduling and routing. The inventory will be the fundamental point to trigger the multiperiod method. I wa...