Question

Lingo!不知道出了什么错,求高人指出

Answer 1

没有可行解 自己找约束里面的错误

sets:

station / 1..5/:u,demand;

link( station,station):

dist,

x,

cost;

A;

endsets

n = @size ( station);

data:

dist = 0 30 10 60 90

30 0 64 12 43

10 64 0 44 67

60 12 44 0 56

90 43 67 56 0;

cost = 0.0 3.1 2.7 2.8 3.4

2.9 0.0 2.8 3.2 2.6

2.7 2.8 0.0 2.9 3.5

2.5 2.9 2.9 0.0 2.7

3.2 2.7 3.4 2.7 0.0;

demand= 0 2 2 1 3;

enddata

min = @sum( link:dist * x * cost);

distance = @sum( link:dist * x);

@FOR( station( K):

@sum( station( I)| I #ne# K:x( I,K)) = 1;

@sum( station( J)| J #ne# K:x( K,J)) = 1);

@for(station(I)|I #gt# 1:

@for( station( J)| J#gt#1 #and# I #ne# J:

u(I)-u(J)+n*x(I,J)