title: python dataframe write to R data format
body: <p>I  have a question with writing a dataframe format to R.</p>
  
  <p>I have 1000 column X 77 row data. I want to write this dataframe to R data.</p>
  
  <p>When I use function of </p>
  
  <pre><code>r_dataframe = com.convert_to_r_dataframe(df)
  </code></pre>
  
  <p>it gives me an error like dataframe object has no arttribute type.</p>
  
  <p>When I see the code of com.convert_to_r_dataframe(). it just get the column of dataframe, and get the colunm.dtype.type. 
  In this moment, the column is dataframe, I think large columns dataframe has inside dataframes?
  Any one have some idea to solve this problem?</p>