title: Removing a single element (not an entire row/column) from a numpy array
body: <p>Is there a way to remove just a single element in a 2d numpy array?</p>
  
  <p>For example, let's say I have:
      <code>x = np.array([[1, 2], [3, 4]])</code></p>
  
  <p>and I want the new version of x to just store <code>np.array([[1], [3, 4]])</code>.</p>
  
  <p>Is this doable? </p>