Lingo建模语言与实例4

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目标与约束段
集合段（SETS    ENDSETS）
) j- ?8 O5 P0 {" V0 o# l9 F; L数据段（DATA   ENDDATA）
初始段（INIT  ENDINIT）
( p, `# p" {' |& L/ D( u+ w. N: @4 O（计算段 (CALC ENDCALC)）
1 m  d' P: D* Q' v% ^MODEL:
# [3 B( u4 F2 @1 a) ITitle Location Problem;
$ e% U" L6 P) u  ^$ q/ ^  I4 Wsets:
! {" |4 r6 v4 S    demand/1..6/:a,b,d;
5 }: H5 e5 p0 e# C    supply/1..2/:x,y,e;
5 n  x" ]2 |' R6 y9 p+ Y( S5 W    link(demand,supply):c;
endsets
data:
a=1.25,8.75,0.5,5.75,3,7.25;
; |+ h& p, f6 f) L+ ]5 }9 ib=1.25,0.75,4.75,5,6.5,7.75;
. u1 ~/ Y% {+ G+ q) b* Wd=3,5,4,7,6,11; e=20,20;
6 x7 {& [; G8 I. genddata
init:
x,y=5,1,2,7;
8 M# p: W5 \1 fendinit
: X" z; Z0 W7 l9 {6 Y. f  Q, g( jmin=@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
: v" X) ?, n/ X3 p

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