如何声明联合集？ CPLEX

Question

我正在尝试在 CPLEX OPL 上构建模型并面临声明一组并集的问题

5 set of union I have to declare

我是 CPLEX 的新手，我已经使用了与文档相同的方法来声明一个集合：

{float} all_nodes = hubs_nodes union suppliers_nodes union clients_nodes;
{float} IH = hubs_nodes union suppliers_nodes; 
{float} A1[IH][IH];
{float} JH = clients_nodes union suppliers_nodes;
{float} A2[JH][JH];
{float} A3[hubs][hubs];   
{float} A[all_nodes][all_nodes];

我的模型声明：

     minimize sum(k in hubs) operating_hub_cost[k]*allocation_variable[k][k] 
 + sum(i in suppliers, k in A3, l in A3) cih*distance[k][l]*total_quantity_flow[i]*fraction_flow_shipped[i][k][l]
 + sum(i, j in A1) cc*distance[i][j]*vehicle_traverses[i][j] + sum(i, j in A2) cd*distance[i][j]*vehicle_traverses[i][j]
 + sum(i in suppliers, k in hubs) one_unit_cost[k]*total_quantity_flow[i]*allocation_variable[i][k]
 + sum(i in suppliers, k,l in A3) one_unit_cost[l]*total_quantity_flow[i]*fraction_flow_shipped[i][k][l]
 + sum(k in hubs, i in suppliers || i in clients) vehicle_cost*vehicle_traverses[k][i];

它告诉我错误：

Cannot use the type {float}[hubs][hubs] with "in".

如何在我的代码中设置不出现 A、A1、A2、A3 错误的情况下声明模型？多谢指教

Answer 1

对于 A 你可以这样写

range N=1..4;

tuple arc
{
int i;
int j;
};

{arc} A={<i,j> | i,j in N};

execute
{
A;
}

如何声明联合集？ CPLEX

How to declare set of union? CPLEX

optimization

cplex