Rayan SAAD

Hello, i have a problem and i would like some help, The résolution of mu model comes with a 0 objectife function like you can see, So i dont know how is it possible, and what does it mean  Thanks a...

Hello, I have a lillte probleme and would appreciate your help, I created a variable X[i,j] I want to add constraints on X dependently of i, for example if i equal to 2,3,4 i have a constraint  and...

Hello, i have a problem and i would appreciate your Help, I've built a fairly heavy optimization model, tested it on simple problems and it works,But when I put in the real data (go from 5 products...

Hello,  i set a time limit of 5 minutes  for my modèle, but when the 3 minutes are over, i still dont have the solution, Thank you 

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 ...

Helloo, I have 2 binary variables Z[i,j,e] and u[i,j,e], I want to express this constraint : Z[i,j]+u[i,j] <= 1 (regardless of e) I dont know how to express it in Gurobipy, Thank you !!

Helloo, I have 2 binary variables h[i,j,t] and u[i,j,t] and  I need to express this constraint in my model: if for a given i : u[i,j,t]=1 then for all other i, h[i,j,t]=0, the solution i found is :...

I get the following error for this constraint : for i in range(I): for k in range(K): for t in range(T):             model.addConstr(Tr[i,k,t]==0 or Tr[i,k,t]==9 or Tr[i,k,t]==10 or Tr[i,...

Helloo, i add a constarint on my variable X[i,j,t] like  X[i,j,t] <= 13 But after resolving the model i found that X[0,2,1]=16 I dont where is the mistake; Thank youu 

Helloo, Please, i have a littel problem, i need some help I defined this Binary variable Z After that i tried to introduce on it the quicksum fonction I have this error message  Thank you,