title: value error when using numpy.savetxt
body: <p>I want to save each numpy array (A,B, and C) as column in a text file, delimited by space:</p>
  
  <pre><code>import numpy as np
  
  A = np.array([5,7,8912,44])
  
  B = np.array([5.7,7.45,8912.43,44.99])
  
  C = np.array([15.7,17.45,18912.143,144.99])
  
  np.savetxt('test.txt', (A, B, C), fmt='%s %s %s')
  </code></pre>
  
  <p>But I got following error:</p>
  
  <p>ValueError: fmt has wrong number of % formats:  %s %s %s</p>
  
  <p>How to solve it?</p>