模型定义错误，求解决方法。。

花落无语

model:
sets:
n/1..20/;
a/1..13/:demand;
links(n,a):b,x;
endsets
data:
demand,b=@ole('D:\123.xls');
enddata
min=@sum(links:b*x(i,j));
@for(a(j):
  @sum(n(i): x(i,j))=1);
@for(n(i):
  @sum(a(j): x(i,j))<=1);
@sum(links:x(i,j))=13;
@for(linksbin(x));
End

madiolee1

模型定义错误，求解决方法。。http://www.madio.net/thread-123429-1-1.html