[求助]新手求助~（关于初级的神经网络问题） [复制链接]

各位大虾，我在网上看到的教程里的一个程序段，本来想要试试看的： n71r_S*  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); knu,"<  
net.trainParam.show = 50; 6"LcJ%o  
net.trainParam.lr = 0.05; =1FRFZI!j  
net.trainParam.epochs = 300; j\[dx^\=  
net.trainParam.goal = 1e-5; 7Utn\l  
p = [-1 -1 2 2;0 5 0 5]; UAkT*'cB  
t = [-1 -1 1 1]; 7{e 4c  
net=train(net,p,t); [i21FX  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 MnsJEvn/  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 ~RW+GTe  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 >a!/QMh  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 Z, zWuE3  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 :[p}  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 )Ys x}vSZ  
TRAINGD, Performance goal met. qTRsZz@  
a = sim(net,p) !_]Y~[  
plot(p,t,p,a,'o') 9Z@hPX3.  
但是为什么老是报错： :;RMo2Tl  
??? Input argument "net" is undefined. @
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