%% Problem 1 on the take home exam: 

% Be sure and download the Matlab data file to a directory with this m-file
load Exam2THQ1;  % This load X (100 x 3) and Xtest (10 x 2).

%% Set up the matrix for the least squares problem.  
% Think about it column-wise, where the x's are in X(:,1), the y's are in
% X(:,2), and the z's are in X(:,3).