[求助]新手求助~（關(guān)于初級的神經(jīng)網(wǎng)絡(luò)問題） [復(fù)制鏈接]

各位大蝦，我在網(wǎng)上看到的教程里的一個程序段，本來想要試試看的： !irX[,e  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd');
)ejXeg  
net.trainParam.show = 50; dn)tP6qc/  
net.trainParam.lr = 0.05; 1z};"A  
net.trainParam.epochs = 300; Y%?!AmER  
net.trainParam.goal = 1e-5; QhE("}1  
p = [-1 -1 2 2;0 5 0 5]; ^K77V$v  
t = [-1 -1 1 1]; RSWB!-  
net=train(net,p,t); ;cm{4%=Iqe  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 1(;33),P8  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 #Mem2cz  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 Kt* za  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 i2ml[;*
,N  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 4qSS<SqY  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 ^%*{:0'
 
TRAINGD, Performance goal met. &A5[C{x  
a = sim(net,p) h&)vdCCk  
plot(p,t,p,a,'o') MTITIecw=  
但是為什么老是報錯：
://|f  
??? Input argument "net" is undefined. fN*4(yw