lingo 错误的1017

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lingo 错误的1017
我在model后面打过：
model:
sets:
para/1..3/:y;
warehouses/wh1..wh3/:capacity;
vendors/v1..v4/:demand;
links(warehouses,vendors):cost,volume;
endsets
目标函数;
min=@sum(links:cost*volume)+91y(1)+70y(2)+24y(3);
@for(para:@bin(y));
需求约束;
@for(vendors(J):
@sum(warehouses(I):volume(I,J))=demand(J));
产量约束;
@for(warehouses(I):
@sum(vendors(J):volume(I,J))

model:
sets:
para/1..3/:y;
warehouses/wh1..wh3/: capacity;
vendors/v1..v4/: demand;
links(warehouses,vendors): cost, volume;
endsets
!目标函数;
min=@sum(links: cost*volume)+91*y(1)+70*y(2)+24*y(3);
@for(para:@bin(y));
!需求约束;
@for(vendors(J):
@sum(warehouses(I): volume(I,J))=demand(J));
!产量约束;
@for(warehouses(I):
@sum(vendors(J): volume(I,J))
再问：请问原来哪里错了？
再答：少了乘号

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