Originally posted by: Cplex

Hey guys!

I have a problem with the following model in CPLEX:

//Indizes

range I = 1..3;     
range T = 1..2;     
range Q = 1..5;     
range K = 1..2;      

//parameters

int c[I][T] =...; 
int P =...;         
int D =...;           
int b[I][Q] =...;  
int B[Q][T] =...;   
int t[I][K] =...;   

//decision variables

dvar boolean x[I][T];      

//objective

dexpr int Kosten = sum(i in I,t in T) c[i][t]*x[i][t];
minimize Kosten;

//constraints

subject to{

    forall(i in I)
      sum(t in T) x[i][t] == 1;
      
    forall(t in T)
      sum(i in I) x[i][t] <= P;
      
    forall(q in Q,t in T)
      sum(i in I) b[i][q]*x[i][t] <= B[q][t];

    forall(k in K,t in T)
      sum(i in I) t[i][k]*x[i][t] <= D;

}

In the last constraint it says that t[i][k] is not an array type. I can't figure out the problem.

Any hints are highly appreciated.

Thanks in advance!

Hi

you get this error because you have t both in

int t[I][K] =...;

and in

forall(k in K,t in T)

The second one overloads the first one and then t is considered not as an array but as an element in T!

regards