title: R_HOME Error with rpy2
body: <p>I know there are quite a few posts on getting up and running with rpy2 on windows 7 32 bit.  I have referenced a good number of them and attempted their solutions, including the use of <code>PypeR</code>. </p>
  
  <p>I dont explicitly have a R_HOME variable set in my path, but per this <a href="https://stackoverflow.com/questions/4924917/trouble-installing-rpy2-on-win7-r-2-12-python-2-5">question</a>, I confirmed that R is in my PATH (I can type <code>R</code> at the command line and get R to run) and even copied all of the files from the i386 folder to the parent <code>bin</code> folder.</p>
  
  <p>My issue is pasted below.  Any thoughts?</p>
  
  <pre><code>In [5]: from rpy2 import robjects
  ---------------------------------------------------------------------------
  RuntimeError                              Traceback (most recent call last)
  &lt;ipython-input-5-1f019d00d232&gt; in &lt;module&gt;()
  ----&gt; 1 from rpy2 import robjects
  
  C:\Anaconda\lib\site-packages\rpy2\robjects\__init__.py in &lt;module&gt;()
       16 import rpy2.rlike.container as rlc
       17
  ---&gt; 18 from rpy2.robjects.robject import RObjectMixin, RObject
       19 from rpy2.robjects.vectors import *
       20 from rpy2.robjects.functions import Function, SignatureTranslatedFunction
  
  C:\Anaconda\lib\site-packages\rpy2\robjects\robject.py in &lt;module&gt;()
        3 import rpy2.rinterface
        4
  ----&gt; 5 rpy2.rinterface.initr()
        6
        7 import conversion
  
  RuntimeError: R_HOME not defined.
  </code></pre>