R is a programming language and software environment for statistical computing. RLink is the included Wolfram Language package to connect R with your Wolfram product, using JLink and RJava/JRI libraries. It allows you to exchange data between the Wolfram Language and R, as well as to evaluate R code from within the Wolfram Language.

To connect R with the Wolfram Language, a few additional setup steps are required. Note that Wolfram products based on Wolfram Language 13.0 only work with R versions up to 3.6.3.

1. Make sure your machine has a recent JDK (Java development kit).
2. If R is not yet installed on your machine, download its version 3.6.3 from a trusted location and install it.
3. If on Windows, set the environment variable JAVA_HOME to the location of your JDK for your current R session:
   • Go to your System Properties window by opening your Start Menu, searching for “environment variables” and selecting “Edit the system environment variables”.
   • On the Advanced tab, select Environment Variables and add or edit the JAVA_HOME variable to point to your JDK location.
     By default, the JDK location is C:\Program Files\Java\jdk-11.0.8\bin .
     
4. Start your R distribution’s interactive console.
5. In the console, install the rJava library:

   > install.packages('rJava')

6. Look up and note down the location of the installed rJava and JRI libraries of your R installation:

   > .libPaths() 

   On Windows, these typically read:

   [1] "C:/Users/Wolfram/Documents/R/win-library/3.6" "C:/Program Files/R/R-3.6.3/library" 

   On macOS:

   [1] "/Library/Frameworks/R.framework/Versions/3.6/Resources/library"

   On Linux:

   [1] "/usr/lib64/R/library" "/usr/share/R/library"

7. In your Wolfram program, evaluate the following inputs to install R.
   
   

   On Windows, if the paths you noted down in the previous step are "C:/Users/Wolfram/Documents/R/win-library/3.6", "C:/Program Files/R/R-3.6.3/library":

   In[1]:= JLink`UninstallJava[]
   
   In[2]:= Needs["RLink`"]
   
   In[3]:= InstallR["RVersion" -> "3.6.3", "RHomeLocation" -> "C:/Program Files/R/R-3.6.3/", "JRINativeLibraryLocation" -> "C:/Users/Wolfram/Documents/R/win-library/3.6/rJava/jri/x64"]

   On macOS, if the path you noted down in the previous step is "/Library/Frameworks/R.framework/Versions/3.6/Resources/library":

   In[1]:= JLink`UninstallJava[]
   
   In[2]:= Needs["RLink`"]
   
   In[3]:= InstallR["RVersion" -> "3.6.3", "RHomeLocation" -> "/Library/Frameworks/R.framework/Versions/3.6/Resources", "JRINativeLibraryLocation" -> "/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rJava/jri"]

   On Linux, if the paths you noted down in the previous step are "/usr/lib64/R/library", "/usr/share/R/library":

   In[1]:= JLink`UninstallJava[]
   
   In[2]:= Needs["RLink`"]
   
   In[3]:= InstallR["RVersion" -> "3.6.3", "RHomeLocation" -> "/usr/lib64/R/library/Frameworks/R.framework/Versions/3.6/Resources", "JRINativeLibraryLocation" -> "/usr/share/R/library/rJava/jri"]

8. Evaluate the following examples to verify the R installation was successful:

   In[4]:= REvaluate["R.Version()"]
   Out[4]= RObject[{{"x86_64-w64-mingw32"}, {"x86_64"}, {"mingw32"}, {"x86_64, mingw32"}, {""}, {"3"}, {"6.1"}, {"2019"}, {"07"}, {"05"}, {"76782"}, {"R"}, {"R version 3.6.3 (2019-07-05)"}, {"Action of the Toes"}}, 
   RAttributes["names" :> {"platform", "arch", "os", "system", "status", "major", "minor", "year", "month", "day", "svn rev", "language", "version.string", "nickname"}]]

   In[5]:= REvaluate["1:10"]
   Out[5]= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}