CODEWITHSUNDEEP
pythonrjupyter-notebookanacondarpy2
Grayson Felt
Grayson Felt

Reputation: 117

OSError: cannot load library 'C:\Program Files\R\R-4.0.2\bin\x64\R.dll': error 0x7e

I am trying to import the rpy2 library into a Jupyter Notebook but I cannot get past this error.

The PATH 'C:\Program Files\R\R-4.0.2\bin\x64' has been added.

This is the only version of R installed on my computer. I have completely uninstalled and reinstalled R/Rstudio/Anaconda with no luck.

Here is the full error:

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-7-098f0d39b3a3> in <module>
----> 1 from rpy2.robjects import pandas2ri

C:\Anaconda\lib\site-packages\rpy2\robjects\__init__.py in <module>
     14 from functools import partial
     15 import types
---> 16 import rpy2.rinterface as rinterface
     17 import rpy2.rlike.container as rlc
     18 

C:\Anaconda\lib\site-packages\rpy2\rinterface.py in <module>
      4 import typing
      5 from typing import Union
----> 6 from rpy2.rinterface_lib import openrlib
      7 import rpy2.rinterface_lib._rinterface_capi as _rinterface
      8 import rpy2.rinterface_lib.embedded as embedded

C:\Anaconda\lib\site-packages\rpy2\rinterface_lib\openrlib.py in <module>
     42     rlib = _rinterface_cffi.lib
     43 else:
---> 44     rlib = _dlopen_rlib(R_HOME)
     45 
     46 

C:\Anaconda\lib\site-packages\rpy2\rinterface_lib\openrlib.py in _dlopen_rlib(r_home)
     35         raise ValueError('The library path cannot be None.')
     36     else:
---> 37         rlib = ffi.dlopen(lib_path)
     38     return rlib
     39 

OSError: cannot load library 'C:\Program Files\R\R-4.0.2\bin\x64\R.dll': error 0x7e

edit:

Here is the code I run to import rpy2 library:

from rpy2.robjects import r, pandas2ri

Upvotes: 7

Views: 11349

Answers (5)

Jonas Lindel&#248;v
Jonas Lindel&#248;v

Reputation: 5683

The other answers work for Python < 3.8 but since 3.8, setting PATH and other environmental variables using os.environ() stopped working. For security reasons, environmental paths no longer resolves DLLs. This answer has more details.

Instead, include the DLL path explicitly before loading rpy2:

import os
os.add_dll_directory(r"path_to_R/bin/x64/")  # E.g., "C:/Program Files/R/R-4.3.1/bin/x64"
from rpy2.robjects import pandas2ri

Upvotes: 1

Omar usuriaga najera
Omar usuriaga najera

Reputation: 1

try:
    import rpy2.robjects as robjects

except OSError as e:

    try:
        import os
        import platform
        if 'Windows' in platform.system():
            os.environ["R_HOME"] = 'C:/Program Files/R/R-4.2.1'
            os.environ["PATH"] = "C:/Program Files/R/R-4.2.1/bin/x64;" + os.environ["PATH"]
        import rpy2.robjects as robjects
    except OSError:
        raise e

Upvotes: 0

Sohail
Sohail

Reputation: 66

Import it on top, before importing r packages.

import os
os.environ["R_HOME"] = r"C:\\Program Files\\R\\R-4.2.1" 
os.environ["PATH"] = r"C:\\Program Files\\R\\R-4.2.1\\bin\\x64" + ";" + 
    os.environ["R_HOME"]

Upvotes: 0

Grayson Felt
Grayson Felt

Reputation: 117

1 - Windows + IDE

For those not using Anaconda, add the following in Windows' environment variables PATH:

C:\Program Files\R\R-4.0.3\bin\x64

Your R version may differ from "R-4.0.3"

2 - Anaconda

Otherwise, check Grayson Felt's reply:

I found a solution here.

Adding the PATH

C:\Users\username\Anaconda2;C:\Users\username\Anaconda2\Scripts;C:\Users\username\Anaconda2\Library\bin;C:\Users\username\Anaconda2\Library\mingw-w64\lib;C:\Users\username\Anaconda2\Library\mingw-w64\bin

and subsequently restarting Anaconda fixed the issue.

3 - Code header Windows basic

Alternatively, following Bruno's suggestion (and being more sohpisticated):

try:
    import rpy2.robjects as robjects
except OSError as e:
    try:
        import os
        import platform
        if ('Windows', 'Microsoft') in platform.system():
            os.environ["R_HOME"] = 'C:/Program Files/R/R-4.0.3/bin/x64'  # Your R version here 'R-4.0.3'
            os.environ["PATH"] = "C:/Program Files/R/R-4.0.3/bin/x64" + ";" + os.environ["PATH"]
        import rpy2.robjects as robjects
    except OSError:
        raise(e)

This code won't be effective for non-Windows platform. Also adjustments may be necessary for different R versions. If it gets more complicated than this, you should probably just go for solutions 1 or 2.

NOTE: You may also face this issue if your Python and R versions are in different architechtures (x86 vs x64)

Upvotes: 3

Bruno Gabuzomeu
Bruno Gabuzomeu

Reputation: 1081

Here is my working solution:

import os
os.environ["R_HOME"] = r"D:\Install\R\R-3.6.1"
os.environ["PATH"]   = r"D:\Install\R\R-3.6.1\bin\x64" + ";" + os.environ["PATH"]
import rpy2
from rpy2.robjects import pandas2ri, packages
pandas2ri.activate()
stats = packages.importr('stats')

Upvotes: 7

Related Questions