物流系统规划.doc

Logistics Systems Analysis
You are working for ABC Shipping Company. Suppose the short-term demand rate is known in the4);
dingdian=[0,firstbatch];
matrixdd=[]; % matrixdd records the sequence %
qiedian=[D,*D*D];
waitingcost=0;
N=0;
cost=0;
while dingdian(2)<2500
a=*qiedian(1);
b=qiedian(2)-a*qiedian(1);
x=(qiedian(1)-12)::(qiedian(1)+12);
y=a*x+b;
plot(x,y);
waitingcost=waitingcost+huatu(dingdian(1),qiedian(1));
N=N+1;
matrixdd=[matrixdd;dingdian]
nextdd=[qiedian(1),a*qiedian(1)+dingdian(2)-a*dingdian(1)];
x=(dingdian(1)-10)::(qiedian(1)+10);
y=a*x+dingdian(2)-a*dingdian(1);
plot(x,y);
qiedian=[sqrt(4*nextdd(2)),nextdd(2)];
dingdian=nextdd;
end
waitingcost=waitingcost+huatu(dingdian(1),100);
N=N+1;
matrixdd=[matrixdd;[dingdian(1),2500]]
fixedcost=2400*N;
cost=fixedcost+waitingcost;
%the following commandsare to schedule the problem with different initial point. The interval is 5. %
flagbatch=0;
flagcost=10000000;
for i=5:5:2500
if simu(i)<flagcost
flagbatch=i;
flagcost=simu(i);
end
end
flagbatch
flagcost
The result of running:
flagbatch=135
flagcost=34243
Run again with the batch 135,the result is shown in Figure 1:
Figure 1
To make the result more precise, the interval of 1item is used:
flagbatch=0;
flagcost=10000000;
for i=1:1:2500
if simu(i)<flagcost
flagba