Originally posted by: GMB7_Wang_Kefeng

forall(j in C)
sum(i in N1,k in V)x[i][j][k]==1;

In the above constraint, I want to add one new condition: i!=j.

Who can tell me how I add this conditon ?
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

Try this;

forall(j in C)
sum(i in N1,k in V : i!=j)x[i][j][k]==1;

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: GMB7_Wang_Kefeng

Thank you. If the constraint is form like 1 and 2 in the following, how to add the condition i!=j then?

1. forall(j in C)
sum(i in N1)
z[i][j]-
sum(i in N2)
z[j][i]==deliverydemand[j];

2. forall(h in C, k in V)
sum(i in N1)
x[i][h][k]==
sum(j in N2)
x[h][j][k];
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

forall(j in C)
sum(i in N1 : j != i)
z[i][j]-
sum(i in N2 : j != i)
z[j][i]==deliverydemand[j];

should work.
#DecisionOptimization
#OPLusingCPLEXOptimizer