lingo报错，怎么改都不行

Question

model
sets:
row/1..2/:b;
col/1..3/:c,x;
links(row,col):a;
endsets
data:
c=3 -1 -1
a=1 -2 1 4 -1 -2
b=11 -3
enddata
MAX=@sum(col:c*x);
@for(row(i):@sum(col(j):a(i,j)*x(j))<b(i));
-2x1+x3=1;
end

报错下标标了数字1，怎么改都显示报错

Answer 1

是不是得软件问题啊