function net_2 = NeuralNetBackpropOutput(w_1,w_2,xvec)
% Calculate output of 2-layer network.
%
% By: Neil E. Cotter
% 11/03/2010
%
% Sigmoidal 2-layer neural net.
% Output neuron is linear (no squasher).

N = size(w_1,1);

% Calculate the neuron outputs for 1st layer.
for neuron_index = 1:N
  % Calculate weights * inputs.
  net_1(neuron_index) = w_1(neuron_index, :) * xvec';

  % Calculate output of 1st-layer neuron.
  o_1(neuron_index) = 1/(1 + exp(-net_1(neuron_index)));
end

% Calculate output of output neuron.
net_2 = w_2 * [1, o_1]';