lingo 程序错误 代码如下,

lingo 程序错误 代码如下,
MODEL:
SETS：
row/1..2/:a;
col/1..3/:b,x;
link(row,col):c;
ENDSETS
DATA:
a=8,6;
b=2,3,1;
c=1,4,2,
3,2,0;
ENDDATA
min=@SUM(col:b*x);
@FOR(row(i):@SUM(col(j):c(i,j)*x(j))>=a(i));
END