求助

422258511

p=[724.570000000000,739.774223126620,771.489090673942,804.563606600594,839.056060404793,875.027240514377,912.540541418428,951.662075391767,992.460789009143,1035.00858465455]
t=[724.570000000000,746.620000000000,778.270000000000,800.800000000000,827.750000000000,871.100000000000,912.370000000000,954.280000000000,995.010000000000,1037.20000000000]
[pn,minp,maxp,tn,mint,maxt]=premnmx(p,t);          %原始数据归一化

' t3 e! L! X/ m3 x; Cnet=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;
net.trainParam.epochs=10000;
' ^( b* _" m- s  t8 L' f9 X/ @* q2 qnet.trainParam.goal=1e-5;
, I+ Q& A# }; }+ \[net,tr]=train(net ,pn,tn);                              %调用TRAINGDM算法训练BP网络
$ v. p  ]- V0 s1 a8 ]6 t/ v, o0 U7 U
an=sim(net,pn);                               %对BP网络进行仿真
8 t9 F/ u; Z" ]* c4 ~! ra=postmnmx(an,mint,maxt);                     %还原数据
7 ^3 Y" Z' ]. b% |x=2001:2010;
5 l+ `* ]4 i/ F5 u. Mnewk=a(1,;
# [& \* H2 S" b& m( C& Vplot(x,newk,'r-o',x,t,'b--+')
+ Y3 }: B0 d' V) Clegend('网络输出值/万人','实际人口数/万人');
& d  `$ }1 V' d( ?xlabel('年份');
ylabel('人口数');
! y) T; m# }& F' htitle('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]
0 o% |8 i. e+ ~0 }( K3 wpnew=pnew1
3 B. U$ Y  R+ w4 X( Dpnewn=tramnmx(pnew,minp,maxp);
anewn=sim(net,pnewn);                               %对BP网络进行仿真
  Z3 v+ A0 B' N7 F% g# _anew=postmnmx(anewn,mint,maxt);                     %还原数据
6 R( k3 d; K4 k. B) z( xy=anew'
5 @, G' |$ |8 H9 K, M7 d$ s; o  K6 X

预测的结果怎么都一样呀？》？？求助

wssl103050