title: How to save multi-dimensional array in matlab?
body: <p>I have an array <code>M=(1000000,12,2,2)</code>.</p>
  
  <p>How do I write it to a file to work on later?</p>
  
  <pre><code>save('filename.txt','M','-ASCII')
  </code></pre>
  
  <p>doesn't seem to work...</p>
  
  <p>Regards,</p>