Originally posted by: 88Simon88

Hello everybody,

I want to write a code like this, but I face an error. Why?

execute DISPLAY_OBJ
{
    var ofile = new IloOplOutputFile("OPL.txt");
    
    for (var t = 1; t <= 4; t++)
    {
        for (var i = 1; i <= 81; i++)
        {
            for (var p = 1; p <= 7; p++)
            {
                 Obj[s] == L[s][t][i][p] * price_infested_woods[p] - X[s][t][i] * harvesting_cost + I[s][T+1][i][p] * price_infested_inventory[p] - Z[s][t] * purchasing_price;
             }                        
        }                
    }    
    ofile.close();
}

Hi,

and if you change

 Obj[s] == L[s][t][i][p] * price_infested_woods[p] - X[s][t][i] * harvesting_cost + I[s][T+1][i][p] * price_infested_inventory[p] - Z[s][t] * purchasing_price;

into

 Obj[s] = L[s][t][i][p] * price_infested_woods[p] - X[s][t][i] * harvesting_cost + I[s][T+1][i][p] * price_infested_inventory[p] - Z[s][t] * purchasing_price;

?

regards

PS:

https://medium.com/@alexfleischer_84755/optimization-simply-do-more-with-less-zoo-buses-and-kids-66940178db6