title: how to set the RHOME before import rpy?
body: <p>I am trying to set up a tool on a web server. Since there are different versions of R, I want to specify it before I import rpy2. I found the following commands from the previous discussion. But it returns me "ImportError: No module named rpy_options". Anyone knows the problem?</p>
  
  <pre><code>from rpy_options import set_options
  set_options(RHOME=''…')
  </code></pre>
  
  <p>Following shows the system and the versions of software I am using. Of course, besides these versions there are older version python and R on the server, but I am tying to use the latest ones.</p>
  
  <ul>
  <li>System: CentOS release 5.7</li>
  <li>Python version: 2.7.8, </li>
  <li>R version 3.1.1 (2014-07-10), </li>
  <li>rpy2 version: 2.4.3</li>
  </ul>
  
  <p>Thanks </p>