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标题: 关于一道求解n-center的问题 [打印本页]

作者: heavenyhz 时间: 2010-4-1 13:22
标题: 关于一道求解n-center的问题
我刚刚开始接触linggo，下面代码是我写的一个求解n-center问题的代码。但是运行时，总说我end行错误，这是为什么呢？多谢指点！！

MODEL:
!2-center Problem
SETS:
Marcket/ M1.. M12/:Wi, Hi, WDst, Dvy;
!Hi is the fixed operation cost at each marcket.
  Wi is Cij* #of load, where Cij is unit cost per distance;
Center /C1.. C12/ ;
LINKS (Marcket, Center): Dist, Xij, Sij,Connection;
CloDist(Marcket,LINKS) : Dis21Cent ;
ENDSETS
DATA:
Hi = 200 210 220 300 310 260 150 180 220 305 160 270;
Wi = 2 3 1 5 4 3 4 5 8 2 1 4;

Dist =  0 15  7 54 45 28 18 37 44 38 27 50
      15  0  8 55 46 13 19 38 45 39 28 51
         7  8  0 47 38 21 11 30 37 31 20 43
      54 55 47  0  9 68 36 17 24 38 27 30
      45 46 38  9  0 59 27  8 15 29 18 21
      28 13 21 68 59  0 32 51 58 52 41 64
      18 19 11 36 27 32  0 19 26 20  9 33
      37 38 30 17  8 51 19  0  7 21 10 13
      44 45 37 24 15 58 26  7  0 28 17 20
      38 39 31 28 29 52 20 21 28  0 11 34
      27 28 20 27 18 41  9 10 17 11  0 23
      50 51 43 30 21 64 33 13 20 34 23  0;
Connection = 0 0 1 0 0 0 0 0 0 0 0 0
            0 0 1 0 0 1 0 0 0 0 0 0
            1 1 0 0 0 0 1 0 0 0 0 0
            0 0 0 0 1 0 0 0 0 0 0 0
            0 0 0 1 0 0 0 1 0 0 0 0
            0 1 0 0 0 0 0 0 0 0 0 0
            0 0 1 0 0 0 0 0 0 0 1 0
            0 0 0 0 1 0 0 0 1 0 1 1
            0 0 0 0 0 0 0 1 0 0 0 0
            0 0 0 0 0 0 0 0 0 0 1 0
            0 0 0 0 0 0 1 1 0 1 0 0
            0 0 0 0 0 0 0 1 0 0 0 0;

ENDDATA

!Sij<= Dist, Sij is the distance of the center from the lower vertix;
@FOR (LINKS (I,J):
         Sij(I,J) <= Connection (I,J)*Dist (I,J));

   !Xij is the arc that the center is located in. it can only happen in a  arc belonging to connection;
@for (LINKS (I,J): Xij(I,J) <= Connection(I,J));
!we need 2 center;
@FOR( LINKS (I,J):
   @SUM(LINKS(I,J): Xij )= 2);
@for (CloDist (K,I,J): Dis21Cent (K,I,J)=@if( Xij(I,J) #eq# 1,@smin(Dist(K,I)+Sij(I,J),Dist(K,J)+Dist(I,J)-Sij(I,J) ),99999999);
@for (Marcket (K): Dvy(K) = @min(CloDist(K,I,J): Dis21Cent(K,I,J)));
@for (Marcket(K): WDst(K)= Hi(K)+Wi(K)*Dvy(K));
MaxWDst = @Max (Marcket: WDst);
MaxWDst<=Z;
!Objective function;
MIN = Z;
!Xij,  is binery, it has value 1 only when a center is located between  i and j;
@FOR (LINKS: @bin (Xij));
END

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