求助

422258511

p=[724.570000000000,739.774223126620,771.489090673942,804.563606600594,839.056060404793,875.027240514377,912.540541418428,951.662075391767,992.460789009143,1035.00858465455]
5 l( s; t0 V  P( D" kt=[724.570000000000,746.620000000000,778.270000000000,800.800000000000,827.750000000000,871.100000000000,912.370000000000,954.280000000000,995.010000000000,1037.20000000000]
( J4 j5 Z2 A, t; t( 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
. Q! P) [" h# C. Snet.trainParam.show=2000; % 训练网络
net.trainParam.lr=0.01;
net.trainParam.epochs=10000;
net.trainParam.goal=1e-5;
[net,tr]=train(net ,pn,tn);                              %调用TRAINGDM算法训练BP网络

8 i7 Q+ ~7 }' [' W( yan=sim(net,pn);                               %对BP网络进行仿真
& s+ T$ T3 m& w; x( La=postmnmx(an,mint,maxt);                     %还原数据
x=2001:2010;
. u( m- j9 v$ _! B8 t( c1 S9 knewk=a(1,;
plot(x,newk,'r-o',x,t,'b--+')
legend('网络输出值/万人','实际人口数/万人');
" ^! l. s, M4 _% ?/ A; C9 I7 `xlabel('年份');
ylabel('人口数');
title('预测人口数对比表');
( `8 A$ M* ]  l$ h( {% i- M4 U
5 Z: U; H8 B9 d, V' b4 n: H- Npnew1=[1079.38044723977,1125.65457635540,1173.91252408743,1224.23933874207,1276.72371473226,1331.45814888992,1388.53910347951,1448.06717620014,1510.14727747579,1574.88881534617]
pnew=pnew1
, n, {% K+ Z4 }# V( @5 w4 [pnewn=tramnmx(pnew,minp,maxp);
  ~1 x5 a+ @5 h7 p! _: |. eanewn=sim(net,pnewn);                               %对BP网络进行仿真
anew=postmnmx(anewn,mint,maxt);                     %还原数据
( \& ^5 V" s: j+ G( J- x( U/ Cy=anew'
9 E& C4 z. G" M9 y. b7 E5 P6 ~
( f7 C  }; W% }+ I8 L
: A( ~" z1 b% [# I. i预测的结果怎么都一样呀？》？？求助

wssl103050