title: how to add headers to a numpy.ndarray
body: <p>I have a numpy.ndarray having dimensions of 23411 x 3.
  I would like to add headers to the top of the matrix called: "summary", "age", and "label". In that order. </p>
  
  <p>In:</p>
  
  <pre><code>matrix.shape
  </code></pre>
  
  <p>Out:</p>
  
  <pre><code>(23411L, 3L)
  </code></pre>
  
  <p>In:</p>
  
  <pre><code>type(matrix)
  </code></pre>
  
  <p>Out:</p>
  
  <pre><code>numpy.ndarray
  </code></pre>
  
  <p>I tried using the numpy.recarray but it did not work. any suggestions??</p>