Originally posted by: sandeepsinghchauhan

 range L = 1..5;

{int} N[L] = ...;

tuple t
{
int p;
int u;
int q;
}

{t} indexX={<p,u,q> | p in 1..5,u in 1..6,q in N[p]};

dvar float+ X[indexX];

dexpr float Y[p in 1..5] = sum(l in N[p],u in 1..6) (X[indexX]);

dexpr float C = sum(p in 1..6,u in 1..5,l in N[p] ,)(X[indexX]);

ERROR:: Cannot use type int for <p:int,u:int,q:float>. 

please help

Hi

You could write

dexpr float C = sum(p in 1..5,u in 1..6,l in N[p] )(X[<p,u,l>]);

regards