title: Linear regression model in Matlab
body: <p>I have a linear regression prbolem at hand to solve, and I have found that this Matlab function <code>mdl = fitlm(X, y)</code> can do that. Then the new problem occured: after knowing about the usage of this function, I can't use this function in my <code>Matlab R2013a</code>. It always says <code>Undefined function or variable 'fitlm'</code>.</p>
  
  <p>I think this may be due to some settings having not been done, but I am not familiar with Matlab. Can you help me?</p>