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copied!<p>I've encountered a somewhat different but related installation problem and finally found a solution at <a href="http://www.mail-archive.com/rpy-list@lists.sourceforge.net/msg02817.html" rel="nofollow">http://www.mail-archive.com/rpy-list@lists.sourceforge.net/msg02817.html</a></p> <p>After I installed rpy2 2.0.8 via rpy2-2.0.8.win32-py2.6.msi (windows 7 (64bit), python 2.6, R 2.14 (both 32bit and 64bit, via RAndFriendsSetup2140V3.2-1-1.exe)), and tried to import rpy2 within python console, I got the exception:</p> <p><em>Unable to locate R.dll</em></p> <p>Adding the following lines to rinterface/__init__.py made it work:</p> <pre><code>if os.path.exists(os.path.join(R_HOME, 'lib')): ## ADDED ## os.environ['PATH'] += ';' + os.path.join(R_HOME, 'bin') os.environ['PATH'] += ';' + os.path.join(R_HOME, 'modules') os.environ['PATH'] += ';' + os.path.join(R_HOME, 'lib') else: ## ADDED ## os.environ['PATH'] += ';' + os.path.join(R_HOME, 'bin', 'i386') ## ADDED ## os.environ['PATH'] += ';' + os.path.join(R_HOME, 'modules', 'i386') ## ADDED ## os.environ['PATH'] += ';' + os.path.join(R_HOME, 'library') ## ADDED ## # Load the R dll using the explicit path # First try the bin dir: Rlib = os.path.join(R_HOME, 'bin', 'R.dll') # Try bin/i386 subdirectory seen in R 2.12.0 ## ADDED ## if not os.path.exists(Rlib): ## ADDED ## Rlib = os.path.join(R_HOME, 'bin', 'i386', 'R.dll') ## ADDED ## # Then the lib dir: if not os.path.exists(Rlib): Rlib = os.path.join(R_HOME, 'lib', 'R.dll') # Otherwise fail out! if not os.path.exists(Rlib): raise RuntimeError("Unable to locate R.dll within %s" % R_HOME) </code></pre> <p>It turns out that the R.dll is moved but the __init__.py is not updated accordingly. So simply editing the __init__.py file will get things right.</p> <p>Then I tried to replicate Taj G's situation, and I did it. After adding "your_R_installation_dir\bin\i386" into the windows environment variable PATH, the old error disappeared but new one came:</p> <p><em>ValueError: Invalid substring in string</em></p> <p>It seems that some additional pieces need to be installed and a C/C++ compiler needs to be correctly configured. I gave up here. Using easy_install to build rpy2 from source seems really tricky on windows and not officially support at present.</p> <p>Although rpy2 2.0.8 is not a full-fledged version compared with 2.2.4, it is the latest version with standard windows installer on sourceforge. For now, it is the easy choice.</p>

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