title: Saving numpy array to csv produces TypeError Mismatch
body: <p>I have a numpy array with numeric data of the form:</p>
  
  <pre><code>example = numpy.array([[[i for i in range(0, 5)],[0 for j in range(0, 5)]] for k in range(0, 10)])
  </code></pre>
  
  <p>So it's array of 10 groups, where each group consists of 2 lists of equal length and contains only numbers.
  Running the following save code gives me the error below:</p>
  
  <pre><code>numpy.savetxt('exampleData.csv', test, delimiter=',')
  TypeError: Mismatch between array dtype ('int32') and format specifier ('%.18e %.18e')
  </code></pre>
  
  <p>I'm guessing this could be fixed with something in the fmt='xyz' argument, but the documentation isn't particularly clear. Any help would be appreciated.</p>
  
  <p>(In my actual data, the i and j lists are lists of long floats, e.g.'0.0047322940571' etc.)</p>