predict.m

function p = predict(Theta1, Theta2, X)
%PREDICT Predict the label of an input given a trained neural network
%   p = PREDICT(Theta1, Theta2, X) outputs the predicted label of X given the
%   trained weights of a neural network (Theta1, Theta2)

% Useful values
m = size(X, 1);
X = [ones(m, 1) X];

% You need to return the following variables correctly 

% ====================== YOUR CODE HERE ======================
% Instructions: Complete the following code to make predictions using
%               your learned neural network. You should set p to a 
%               vector containing labels between 1 to num_labels.
%
% Hint: The max function might come in useful. In particular, the max
%       function can also return the index of the max element, for more
%       information see 'help max'. If your examples are in rows, then, you
%       can use max(A, [], 2) to obtain the max for each row.
%

% =========================================================================
tmp = X * Theta1';
tmp = sigmoid(tmp);
tmp = [ones(m, 1), tmp];
tmp2 = tmp * Theta2';
tmp2 = sigmoid(tmp2);
[~, p] = max(tmp2, [], 2);

end