各位大侠帮忙给看看这个bp神经网络程序哪里出现错误了

[小手冰凉]

P=[-1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9];
P=P';
T=[-0.832 -0.432 -0.024 0.344 1.282 3.456 4.02 3.232 2.102 1.504 0.248 1.242 2.344 3.262 2.052 1.684 1.022 2.224 3.022 1.984];
T=T';
net=newff(minmax(P),T,[7,1],{'tansig','purelin'},'traingda');
net.trainParam.epochs=15000;
net.trainParam.show = 100;
net.trainParam.goal=0.01;
LP.lr=0.1;
net.trainParam.mc = 0.9;
inputWeights=net.IW{1,1};
inputbias=net.b{1};
% 当前网络层权值和阈值
layerWeights=net.LW{2,1};
layerbias=net.b{2};
[net,tr]=train(net,P,T);