求助

422258511

p=[724.570000000000,739.774223126620,771.489090673942,804.563606600594,839.056060404793,875.027240514377,912.540541418428,951.662075391767,992.460789009143,1035.00858465455]
% z( z; m* A$ W8 c+ i% j# p. ?t=[724.570000000000,746.620000000000,778.270000000000,800.800000000000,827.750000000000,871.100000000000,912.370000000000,954.280000000000,995.010000000000,1037.20000000000]
& h$ V# }5 T. F( A) J% n [pn,minp,maxp,tn,mint,maxt]=premnmx(p,t);          %原始数据归一化

net=newff(minmax(pn),[9,1],{'tansig','purelin'},'traingdx'); %设置网络,建立相应的BP网络
net.trainParam.show=2000; % 训练网络
net.trainParam.lr=0.01;
3 O8 K# @, j: y8 Y2 J0 r8 Z1 V: vnet.trainParam.epochs=10000;
net.trainParam.goal=1e-5;
[net,tr]=train(net ,pn,tn);                              %调用TRAINGDM算法训练BP网络

1 W( p% A0 q. S4 i5 ^4 @9 B3 Fan=sim(net,pn);                               %对BP网络进行仿真
" y  o1 B5 m6 v- r+ d/ Z4 D5 La=postmnmx(an,mint,maxt);                     %还原数据
6 i5 V: ^0 V( Y5 jx=2001:2010;
newk=a(1,;
& y/ \* @7 O# O6 k; S  Uplot(x,newk,'r-o',x,t,'b--+')
legend('网络输出值/万人','实际人口数/万人');
xlabel('年份');
ylabel('人口数');
title('预测人口数对比表');

pnew1=[1079.38044723977,1125.65457635540,1173.91252408743,1224.23933874207,1276.72371473226,1331.45814888992,1388.53910347951,1448.06717620014,1510.14727747579,1574.88881534617]
- B5 Y( ?( W+ a" L; mpnew=pnew1
pnewn=tramnmx(pnew,minp,maxp);
anewn=sim(net,pnewn);                               %对BP网络进行仿真
anew=postmnmx(anewn,mint,maxt);                     %还原数据
4 g- ?" L3 d/ |  ey=anew'

6 e% ?# Q) F; a- [& C
预测的结果怎么都一样呀？》？？求助

wssl103050