Lingo建模语言与实例4

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目标与约束段
集合段（SETS    ENDSETS）
5 r& J- W4 J. B! n$ Z. U" F数据段（DATA   ENDDATA）
; s0 h3 j, t' O* d3 t初始段（INIT  ENDINIT）
（计算段 (CALC ENDCALC)）
- }, w& N* U0 qMODEL:
Title Location Problem;
sets:
    demand/1..6/:a,b,d;
; A; a. y' f" m& m8 `/ ?; }5 a    supply/1..2/:x,y,e;
; F5 S+ y' r% c! U7 x4 N) d    link(demand,supply):c;
endsets
% r3 D3 w- J5 }0 B1 T0 u# H' cdata:
. r  I2 g/ J4 P3 Ca=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.75;
: K0 L1 O+ K4 `8 d1 ~0 a! s1 rd=3,5,4,7,6,11; e=20,20;
enddata
' H% h! }4 P1 |) Linit:
x,y=5,1,2,7;
/ v; t$ Q) W2 g0 K- Wendinit
' C4 z+ r3 B0 O/ S! Pmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
) d7 c+ B/ H9 B0 a@for(demand(i)sum(supply(j):c(i,j))=d(i););
- k6 Z% W% f! Q! ^2 s8 J6 a, P@for(supply(i)sum(demand(j):c(j,i))<=e(i););
- A# x# u" O$ P% V0 h3 P" u: WEND

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