獲取 DOcplexException：無法轉換為表達式： <generator object <genexpr>在 0x7f59feda16d0></generator>

Question

我正在嘗試這段代碼

m.minimize(30 sum(x["Product A",j])+28 sum(I["Product B",j])+0.9 sum(I["Product A",j])+0.75 sum(I ["Product B",j])for i in Products)

它一直給我 DOcplexException: cannot convert to expression: <generator object error

請幫我把它分解或讓它工作

Answer 1

from docplex.mp.model import Model 
m = Model()
Products=["Product A","Product B"]
Days=[1,2]

I = {}

for i in Products:
    for j in Days:
            I[(i,j)] = m.integer_var()

    
m.add(I[("Product A",1)]==10)

m.minimize(m.sum(30*I[("Product A",j)]+28*I[("Product B",j)]+0.9*I[("Product A",j)]+0.75*I[("Product B",j)] for j in Days))

m.solve()

print("objective = ",m.objective_value)

工作正常，給

objective =  309.0