Model infeasible

Awaiting user input

Rayan SAAD

June 23, 2023 20:23

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Hello, 

I want to model a stock management problem,

I have 3 variables :

P[i,t] : Production of product i in period t

X[i,j,t] : Amount of product i in location j in period t ( each location j has its capacity)

F[i,t] : Fictive location ( to avoid model infesability) ( amount of product i that we couldnt stock at period t.

The Constraint i built is :

for i in range(I):
    for t in range(T):
        model.addConstr(gp.quicksum(X[i,j,t] for j in range(J))+F[i,t]==P[i,t]

Logicaly, i wouldn't have any problem of capacity because if the production is too big i can stock in the fictive location F[i,t], but the problem is if the production exceeds a certain number i have an infeasible model.

So i don't now why

Thank you 

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  Jaromił Najman

  • Gurobi Staff

  June 26, 2023 08:20

  Hi Rayan,

  Did you have a look at the Knowledge Base article How do I determine why my model is infeasible?

  Best regards, 
  Jaromił

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