Gurobi Python:如何在约束中编写嵌套总和
问题描述：
我有一个优化问题，我正在使用 Python 和 Gurobi 来优化它.在我的问题公式中，有一个具有嵌套总和的约束.
I have an optimization problem and I'm using Python and Gurobi to optimize it. In my problem formulation there is a constraint that has a nested sum.
我最近开始学习 python，我在 gurobi 文档和示例代码中搜索，但找不到任何嵌套和的示例.
I've recently started learning python and I searched in gurobi documentation and example codes and I couldn't find any example of nested sum.
我想知道是否有人可以帮我解决这个问题.提前致谢！
I was wondering if anyone could help me solve this problem. Thanks in advance!
答
在 quicksum() 函数中使用两个 for 语句，在生成器表达式中使用两个 for 语句:
Use two for statements inside the quicksum() function and two for statements in the generator expression:
mycts = m.addConstrs((quicksum(x[i,f,p]*y[i,f,p,t]
for i in I for p in P[i,f]) <= z[f,t]
for f in F for t in T), "myconstraint")
其中 m 是您的 Model 对象.
where m is your Model object.