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）
1 P( A& b3 q: g$ n- o3 {/ n初始段（INIT  ENDINIT）
  Z" T% ]" P5 h+ R, o9 |3 ~: Q（计算段 (CALC ENDCALC)）
MODEL:
2 f4 l8 G: L9 t3 M) h1 gTitle Location Problem;
& n. R) ?/ n4 O6 L* ssets:
3 A% [. }8 e# {% j9 o    demand/1..6/:a,b,d;
    supply/1..2/:x,y,e;
" C; k, A. {- F5 z3 Z" S    link(demand,supply):c;
8 F5 p% |" Q3 ?& a5 v& yendsets
# O9 }$ c* f1 h! S$ k0 ndata:
6 ]' d& Q, O! \* e5 ua=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.75;
4 e; B; h8 z: H  A! rd=3,5,4,7,6,11; e=20,20;
enddata
init:
x,y=5,1,2,7;
endinit
; B# t! x, @( T  k- xmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
# c; R3 o# ^) E, \* t7 W7 t@for(demand(i)sum(supply(j):c(i,j))=d(i););
) P* s0 W- j4 y& |- O- U@for(supply(i)sum(demand(j):c(j,i))<=e(i););
& Y: C* p4 n+ ~+ {END
) A4 M7 X% e- M: C3 m5 T
9 f6 N3 @. K/ V$ C1 O' U9 C) N