title: Numpy savetxt TypeErrror
body: <p>I'm trying to save a 5D array and I'm having this error.</p>
  
  <pre><code>&gt; Traceback (most recent call last):   File "model_3.py", line 53, in
  &gt; &lt;module&gt;
  &gt;     np.savetxt('../test_set/exp3/X.txt', X_test, delimiter=' ', fmt='%1.12f')   File
  &gt; "/home/jasper/.virtualenvs/thesis/local/lib/python2.7/site-packages/numpy/lib/npyio.py",
  &gt; line 1160, in savetxt
  &gt;     % (str(X.dtype), format)) TypeError: Mismatch between array dtype ('float64') and format specifier ('%1.12f %1.12f %1.12f')
  </code></pre>