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标题: The model is locally infeasible. However, feasible solutions may or may no... [打印本页]

作者: 2012fang 时间: 2015-4-9 18:10
标题: The model is locally infeasible. However, feasible solutions may or may no...
请问我用lingo15求解一下程序，出现The model is locally infeasible. However, feasible solutions may or may not exist in other regions. Consider invoking the global solver or the multistart feature.
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model:
sets:
teachers/1..3/;
students/1..5/:d;
places/p1 p2 p3/;
times/t1 t2/;
majors/m1 m2 m3/;
link1(students,teachers):a;
link2(teachers,times):b;
link3(teachers,majors):c;
link5(teachers,times,places):x;
link6(students,times,places):y;
endsets
[objective] max=@sum(places(p)

sum(times(t)

sum(teachers(l)

sum(students(s)

c(l,d(s))*x(l,t,p)*y(s,t,p))))));
@for(teachers(l)

for(students(s)

for(times(t)

for(places(p):x(l,t,p)*y(s,t,p)<=b(l,t)))));
@for(teachers(l)

for(students(s)

for(times(t)

for(places(p):x(l,t,p)*y(s,t,p)<=c(l,d(s))))));
@for(times(t)

for(places(p)

sum(teachers(l):x(l,t,p))=@floor(3/2)));
@for(teachers(l)

for(students(s)

for(times(t)

for(places(p):x(l,t,p)+y(s,t,p)+a(s,l)<3))));
@for(times(t)

for(places(p)

sum(students(s):y(s,t,p))<=@floor(5/(2*2)+1)));
@for(times(t)

for(places(p)

sum(students(s):y(s,t,p))>=@floor(5/(2*2)-1)));
@for(students(s)

sum(places(p)

sum(times(t):y(s,t,p)))=1);
@for(teachers(l)

for(times(t)

sum(places(p):x(l,t,p))<=1));
@for(link5(l,t,p)

bin(x(l,t,p)));
@for(link6(s,t,p)

bin(y(s,t,p)));
data:
a=1 0 0
  0 0 0
  0 0 0
  0 0 0
  0 0 1;
b=0 1
  1 1
  1 0;
c=0 2 1
  1 2 3
  2 0 3;
d=2 1 1 1 3;
enddata
end
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是什么原因？

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