R/Java

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How to call R from a Java program

Contents

Using JRI (from RJava)

The RJava package also allows calling Java from R.

Set up

  • In R, install the RJava package (necessary?)
  • The RJava package includes the JRI.jar, but to get JRIEngine.jar and REngine.jar, go to JRI files download
  • Add those 3 jars to your lib directory and classpath
  • Make sure the R_HOME environment variable is set
    • Type $R_HOME on the command line to see if it is set and what it is set to
    • In eclipse, you can add environment variables to the run configuration
    • On a mac, add this line to your .profile file (in the root of your user directory, so ~/.profile)
export R_HOME=/Library/Frameworks/R.framework/Resources

Calling R

Other solutions

  • renjin this looks promising, a JVM-based interpreter for R, but still beta
  • Rserve more complicated client/server setup, so more useful for lots of processes needing R
  • Rcaller very simple, but looks clunky for doing anything more than a few lines in R

Helpful links

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