title: Convert RDA to csv
body: <p>I need to convert an rda file to csv. I've tried to load it in R , but I get the following error:</p>
  
  <pre><code>In readChar(con, 5L, useBytes = TRUE) :
    cannot open compressed file file 'data/matrix.rda', probable reason 'No such file or directory'
  </code></pre>
  
  <p>Here is a <a href="http://elisacarli.altervista.org/matrix.rda" rel="noreferrer">link</a> to rda file (<a href="http://elisacarli.altervista.org/matrix.rda" rel="noreferrer">http://elisacarli.altervista.org/matrix.rda</a>)</p>
  
  <p>Thanks in advance for any suggestion</p>