title: How to create an array or ndarray from a tuple of arrays
body: <p>Say if I have </p>
  
  <pre><code>s=np.zeros((5,5))
  array([[ 0.,  0.,  0.,  0.,  0.],
         [ 0.,  0.,  0.,  0.,  0.],
         [ 0.,  0.,  0.,  0.,  0.],
         [ 0.,  0.,  0.,  0.,  0.],
         [ 0.,  0.,  0.,  0.,  0.]])  #which is an ndarray
  
  s2=[s[ix,1] for ix in range(2,5)],[s[ix2,1] for ix2 in range(2,5)]
  ([0.0, 0.0, 0.0], [0.0, 0.0, 0.0]) #which is a tuple
  </code></pre>
  
  <p>How can I make s2 into an array or ndarray?  Thank you in advance. </p>