title: Combining an array using Python and NumPy
body: <p>I have two arrays of the form:</p>
  
  <pre><code>a = np.array([1,2,3])
  b = np.array([4,5,6])
  </code></pre>
  
  <p>Is there a NumPy function which I can apply to these arrays to get the followng output?</p>
  
  <pre><code>[[1,4],[2,5][3,6]]
  </code></pre>