Lingo建模语言与实例4

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目标与约束段
( H' v! N' X" k6 x+ h9 t集合段（SETS    ENDSETS）
数据段（DATA   ENDDATA）
初始段（INIT  ENDINIT）
# D$ b+ ~4 G. R（计算段 (CALC ENDCALC)）
* m* {6 q9 H0 XMODEL:
Title Location Problem;
. Y" E* U2 I% V0 w" M$ Isets:
6 F' s  w* U! L$ ]/ J9 T    demand/1..6/:a,b,d;
    supply/1..2/:x,y,e;
4 Q* N, j& w' U! ^. h    link(demand,supply):c;
) f  {  T4 X& V5 M7 T  P+ V( kendsets
, s7 p/ \; x# Cdata:
6 k% s5 l0 a4 ]8 E; [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
: e4 F( {/ a9 X5 Qinit:
. {# `6 z' c+ X& E: ~3 Dx,y=5,1,2,7;
endinit
. y5 m9 b1 U. r& @( s* Wmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
: l) m3 X# P" H( ]* M@for(demand(i)sum(supply(j):c(i,j))=d(i););
@for(supply(i)sum(demand(j):c(j,i))<=e(i););
/ d0 J7 r% h  ^* }END

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