title: To average 2-D numpy.array with numpy.mean or numpy.average
body: <p>I am trying to average two-dimensional numpy arrays. So, I used <code>numpy.mean</code> but the result is the empty array.</p>
  
  <pre><code>import numpy as np
  ws1 = np.array(ws1)
  ws1_I8 = np.array(ws1_I8) 
  ws1_I10 = np.array(ws1_I10)
  WSAV = np.mean([ws1,ws1_I8,ws1_I10])
  print WSAV
  </code></pre>
  
  <p>I used both <code>np.mean</code> and <code>np.average</code> but the result is same as the empty array.
  The each of <code>ws1</code>, <code>ws1_I8</code>, <code>ws1_I10</code> has the shape of <code>(18, 75)</code> and I would like to have the result array of <code>(18, 75)</code> shape.</p>
  
  <p>Any idea or help would be really appreciated.</p>