Originally posted by: Cplex

Hey,

 

I'm facing a problem. I wrote my model into ILOG and CPLEX is running without any errors. But the decision variables as well as the objective don't take any value.

 

My formulation looks like that:

 

.mod

 

//indices

range N = 1..2;            //Produktionskapazitätsstufe
range M = 1..2;            //Produkt
range T = 1..2;            //Periode

//parameters

int C[N] =...;           
int D[T][M] =...;      
int K_h =...;          
int K_kp[N] =...;       

//decision variables

dvar int x[T][M];      
dvar int s[0..2][M];   
dvar boolean y[T][N];  

//objective function

dexpr int Kosten = sum(t in T,m in M) K_h * s[t][m] + sum(t in T, n in N) K_kp[n] * y[t][n];
minimize Kosten;

//constraints

subject to{
    
    forall(t in T)
      sum(m in M) x[t][m] <= sum(n in N) C[n] * y[t][n];
    
    forall(t in T)
      sum(n in N) y[t][n] <= 1;
      
    forall(t in T,m in M)
      D[t][m] == x[t][m] + s[t-1][m] - s[t][m];
}

 

 

 

.dat

 

 

C = [1000,2000];

D = [[1000,1800]
     [500, 900]];
    
K_h = 3;
K_kp = [500,800];

 

 

Is there anyone who can help me please?

 

Thanks in advance!!

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: Cplex

Got it!

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi

s = [[1500
             2700]
             [500 900]
             [0 0]];
y = [[0 0]
             [0 0]];
x = [[0 0]
             [0 0]];

regards

#DecisionOptimization
#OPLusingCPLEXOptimizer