How to setup environment variable R_user to use rpy2 in python

Question

I \'m unable to run rpy2 in python.

with this code

 import rpy2.robjects as robjects

Here\'s the full exceptions:

---

R

Answer 1

Combining answers from @laven_qa and @user3758274, here is what worked for me :

# installing steps after downloading .whl from http://www.lfd.uci.edu/~gohlke/pythonlibs/#rpy2
import pip
pip.main(["install", "C:/Users/YOUR_USERNAME/Downloads/rpy2-2.8.6-cp36-cp36m-win_amd64.whl"]) # Path to the file that was downloaded from the website above

# setting temporary PATH variables
import os
os.environ['R_HOME'] = 'C:\Program Files\Microsoft\R Open\R-3.4.0' #path to your R installation
os.environ['R_USER'] = 'C:\ProgramData\Anaconda3\Lib\site-packages\rpy2' #path depends on where you installed Python. Mine is the Anaconda distribution

# importing rpy2
import rpy2.robjects as robjects

# test : evaluating R code
robjects.r('''
        # create a function `f`
        f <- function(r, verbose=FALSE) {
            if (verbose) {
                cat("I am calling f().\n")
            }
            2 * pi * r
        }
        # call the function `f` with argument value 3
        f(3)
        ''')

# returns : 
> R object with classes: ('numeric',) mapped to:
> 
> [18.849556]