lingo建模语言与实例4

longde

目标与约束段
集合段（SETS    ENDSETS）
数据段（DATA   ENDDATA）
初始段（INIT  ENDINIT）
（计算段 (CALC ENDCALC)）
MODEL:
1 o( Z& m$ K) R9 l- O( n. q  V! rTitle Location Problem;
1 |' P$ c! P3 s' Isets:
: v9 U. j* x0 @8 a. E# {4 X# t    demand/1..6/:a,b,d;
    supply/1..2/:x,y,e;
0 D* q  Q& _' L3 p" x1 ^5 |0 B    link(demand,supply):c;
endsets
data:
a=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.75;
d=3,5,4,7,6,11; e=20,20;
enddata
7 M1 V& w7 J; ]3 ]& k8 iinit:
# \  y: q8 D8 W2 c# _) n6 \x,y=5,1,2,7;
endinit
- J: o- p; m* @" T& z8 t& Hmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
2 s# e* z1 a  i' d- Z4 n@for(demand(i)sum(supply(j):c(i,j))=d(i););
@for(supply(i)sum(demand(j):c(j,i))<=e(i););
END

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