John Raphy Karippery

Hello,Thank you for your help. constrain for travelling time doesn't make any changes to my model. something I miss in my model for example, if track1 max time is 20 and start node 1 and end node i...

Hello Maliheh,Thank you for your answer is very helpful.  In my logic, my graph(input) is bi-directional edges. that means there is a route from 8 to 1. But I change input edges and distance like t...

Hello I also need your help to convert to Gurobi.  ORD : Returns the relative position of an element in a set. Note that ord may be used only with one-dimensional, static, ordered sets. For mor...

Do you mean like this? objes = mdl.setObjectiveN(quicksum(x[e,l] for e in es for l in load)-1, 0, 1)

Hello Jaromił, Thank you so much for the replay. how to set model sense to objective.here motive of objective.   objcost 'objective for minimizing cost in K$' objco2 'objective for minimiz...

hello Matthias,Is that possible to implement  ϵ-constraint by using Gurobi? Could you please implement any simple model code for me? for reference  https://www.researchgate.net/profile/Naveenbalaji...

Hello Jaromil,Now I am facing a problem. I used so many variables in my model that is not a good idea.How can use the same variable in different constarins?for example:I used p_ij variables for con...

Thank you for your helpI have small changes in the objective function.\begin{equation}\ Min\ Z=\ \sum_t \sum_{e_{i,j}\ \in E}{x_{i,j}t}\end{equation} we have to define a time window for each truck....

Thank you for helping me.I have a lot of confusion with a time parameter.Does that mean the Objective function will be something like this?  mdl.setObjective(quicksum(cost[i,j] * t for i, j in loca...

Still I have syntax error with my objective function why? set_time =[123, 134, 345, 234, 453, 346, 643, 332]mdl.modelSense = GRB.MINIMIZEmdl.setObjective(quicksum(x[i,j,k,t]* cost[i,j] for i,j in l...