title: Numpy array to csv
body: <p>I have a np array with 1000 rows, and 4608 columns each rows</p>
  
  <p>I try to save a csv file with:</p>
  
  <pre><code>myfile = open('dataset.csv', 'wb')
  wr = csv.writer(myfile,delimiter='\n')
  wr.writerow(Prueba[0])
  </code></pre>
  
  <p>But if I open the csv file with LibreOffice this:</p>
  
  <pre><code>[153 147 147 ..., 142 147 146]  
  [183 247 147 ..., 126 123 104]
  ...
  </code></pre>
  
  <p>No apears the 4608 columns!!</p>
  
  <p>Some idea?</p>
  
  <p>Thank you!</p>
  
  <p>Regards, Andres.</p>