lingo报错 index variables may not share names with other varia

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lingo报错 index variables may not share names with other variables
sets:
teacher/1..8/;
lunshu/1..5/;
link(teacher,lunshu):x;
endsets
min=@sum(link(i,j):x(i,j)*0.5);
@bnd(18,x(i,j),19);
@for(lunshu(j):@sum(teacher(i):x(i,j))=a(j););
@gin(link(i,j):x(i,j));
一直不停地报错!

sets:
teacher/1..8/;
lunshu/1..5/:a;
link(teacher,lunshu):x;
endsets
min=@sum(link(i,j):x(i,j)*0.5);
@for(link(i,j):@bnd(18,x(i,j),19));
@for(lunshu(j):@sum(teacher(i):x(i,j))=a(j););
@for(link(i,j):@gin(x(i,j)));

lingo index variables may not share names with... 急!lingo程序运行时出现以下错误：index variables may not share names with 运行如下lingo程序时,出现index variables may not share names with othe lingo运行时总是出现index variables may not share name with other va Friend who wants to share with each other.怎么翻译? happy things ,share ,sad things,each other,good friends,with you may share your happy time with me lingo,@for函数莫名报错 lingo中@for函数报错, 求大神为什么lingo报错? 求大神lingo 代码为什么报错? lingo 报错 model is ill defined