title: Pandas: Concatenating DataFrame with Sparse Matrix
body: <p>I'm doing some basic machine learning and have a sparse matrix resulting from TFIDF as follows:</p>
  
  <pre><code>&lt;983x33599 sparse matrix of type '&lt;type 'numpy.float64'&gt;'
      with 232944 stored elements in Compressed Sparse Row format&gt;
  </code></pre>
  
  <p>Then I have a DataFrame with a <code>title</code> column.  I want to combine these into one DataFrame but when I try to use <code>concat</code>, I get that I can't combine a DataFrame with a non-DataFrame object.</p>
  
  <p>How do I get around this?</p>
  
  <p>Thanks!</p>