function J = computeCost(X, y, theta)
%COMPUTECOST Compute cost for linear regression
%   J = COMPUTECOST(X, y, theta) computes the cost of using theta as the
%   parameter for linear regression to fit the data points in X and y

% Initialize some useful values
m = length(y); % number of training examples

% You need to return the following variables correctly 
% J = 0;
% for i = 1:m
	% J = J + (theta' * X(i,:)' - y(i)) ^ 2
% end
% J = J / m / 2	
z = (X*theta-y);
J = z' * z / 2 / m;
% ====================== YOUR CODE HERE ======================
% Instructions: Compute the cost of a particular choice of theta
%               You should set J to the cost.





% =========================================================================

end