运输问题lingo_lingo变量多个下标

model:
sets:
factory/1..6/: e;
plant/1..8/: d;
coo(factory,plant): x,c;
endsets

data:
e = 60 55 51 43 41 52;
d = 35 37 22 32 41 32 43 38;
c = 6 2 6 7 4 2 9 5
4 9 5 3 8 5 8 2
5 2 1 9 7 4 3 3
7 6 7 3 9 2 7 1
2 3 9 5 7 2 6 5
5 5 2 2 8 1 4 3;
enddata

!目标函数;
min = @sum(coo(i,j): c(i,j)*x(i,j));
!产量约束;
@for(plant(j):@sum(factory(i):x(i,j))=d(j));
!销量约束;
@for(factory(i):@sum(plant(j):x(i,j))<=e(i));
end

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