title: Horizontal stuck of two arrays using np.hstack in NumPy
body: <pre class="lang-py prettyprint-override"><code>a = np.array([[1, 2], [3, 4]])
  b = np.array([[5, 6]])
  </code></pre>
  <p>Horizontal stuck array a and b using hstack function. To use this function both arrays need to be the same size. Not sure how to do that</p>