Issue with the file nnff.m

[bnaman50]

I was using this toolbox for implementing a simple neural network. But I have a doubt. The way you are calculating the output of the hidden layers is ( nn.a{i} = sigm(nn.a{i - 1} * nn.W{i - 1}'); ), ignoring the bias term 'b'. Can you help me out with that or tell me if it's required or not.

[tambetm]

Bias term is simulated by having one of the inputs 1 all time. Then bias corresponds to weight of this item. These lines in the start of nnff.m implement it:

x = [ones(m,1) x];
nn.a{1} = x;

[bnaman50]

Thanks a lot for your help.