lingo错误代码11：a syntax error has occuredMODEL:Title Location Problem;sets:demand/1..6/:a,b,d;supply/1,2/:x,y,e;link(demand,supply):c;endsetsdata:a=1.25,8.75,0.5,5.75,3,7.25;b=1.25,0.75,4.75,5,6.5,7.75;d=3,5,4,7,6,11;e=20,20;enddatainit:x,y=5,

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lingo错误代码11：a syntax error has occuredMODEL:Title Location Problem;sets:demand/1..6/:a,b,d;supply/1,2/:x,y,e;link(demand,supply):c;endsetsdata:a=1.25,8.75,0.5,5.75,3,7.25;b=1.25,0.75,4.75,5,6.5,7.75;d=3,5,4,7,6,11;e=20,20;enddatainit:x,y=5,
lingo错误代码11：a syntax error has occured
MODEL:
Title Location Problem;
sets:
demand/1..6/:a,b,d;
supply/1,2/:x,y,e;
link(demand,supply):c;
endsets
data:
a=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.75;
d=3,5,4,7,6,11;e=20,20;
enddata
init:
x,y=5,1,2,7;
[OBJ] min=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
@For(demand(i):[DEMAND_CON]@sum(supply(j):c(i,j))=d(i););
@for(supply(i):[SUPPLY_CON]@sum(demand:(j):a(j)));
@for(supply(i):
@bnd(@min(demand(j):a(j)),x(i),@max(demand(j):a(j)));
@bnd(@min(demand(j):a(j)),y(i),@max(demand(j):a(j)));
);
END
我这是一个字也不差照着书上抄的,但是Lingo说[OBJ]的中括号似乎有问题,这是怎么回事啊.我一点也不懂Lingo,