lingo建模语言与实例4

longde

目标与约束段
7 S! M% q. C/ V: E$ W; s集合段（SETS    ENDSETS）
数据段（DATA   ENDDATA）
初始段（INIT  ENDINIT）
（计算段 (CALC ENDCALC)）
MODEL:
7 r9 i$ _' p, I6 \5 sTitle Location Problem;
" x  e# |0 ]0 S6 R2 @& Isets:
    demand/1..6/:a,b,d;
    supply/1..2/:x,y,e;
    link(demand,supply):c;
$ w2 A7 n+ D  s$ q& O& Kendsets
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
9 P! X" \" c* g/ u8 D6 s! L- cinit:
/ v1 S$ j* s3 P% q+ Q& [/ E5 gx,y=5,1,2,7;
* m" W9 K$ K( i) F3 ]endinit
0 d9 z' ^+ ~( ]0 wmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
@for(demand(i)sum(supply(j):c(i,j))=d(i););
@for(supply(i)sum(demand(j):c(j,i))<=e(i););
END
/ J" \' T  p2 M, h  V