[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： j8aH*K-l{  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); AGKT*l.-  
net.trainParam.show = 50; "c.-`1,t  
net.trainParam.lr = 0.05; y=Z[_L!xr  
net.trainParam.epochs = 300; .{|SKhXk  
net.trainParam.goal = 1e-5; %(]B1Zg6,  
p = [-1 -1 2 2;0 5 0 5]; YL78c
WOs  
t = [-1 -1 1 1]; HTMg{_r(%  
net=train(net,p,t); W|"bV 6d3  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 5\h6'  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 vU(fd!V ?  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 /1$u|Gs *  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 .gt;:8fw{  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 BzV97'  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 J _q  
TRAINGD, Performance goal met. pG'?>]Rt4  
a = sim(net,p) y]+[o1]-c  
plot(p,t,p,a,'o') V]m}xZ'?^  
但是为什么老是报错： |gHdTb1  
??? Input argument "net" is undefined. fjY:u,5V_