why do i got "Undefined function or variable 'ba1'"?

net=newff (minmax (P),[8,1],{'tansig','purelin'},'trainlm');

net.IW {1,1} =ba1;

net.b {1} =ba2;

net.LW {2,1} =ba3;

net.b {2} =ba4;

y1=sim (net,P);

[Ameer Hamza]

The error message clearly states the reason. How is the variable ba1 defined in your code? Have you assigned it a value?