R: Recipes for Analysis, Visualization and Machine Learning

Using JRI to call R functions from Java

The JRI allows you to execute R commands inside Java applications as a single thread. JRI loads R libraries into Java and thus provides a Java API to R functions.

Getting ready

Make sure all the steps in the earlier recipe Using Java objects in R are completed.

How to do it...

To use JRI to call R functions from Java, follow these steps:

1. Set up environment variables R_HOME to where R has been installed and add the R bin directory to the environment variable PATH.
2. Open a new terminal window (on OS X and Linux systems) or open a command prompt window on Windows. Make sure to change the values according to your environment. The following commands help to set up environment variables on OS X and Linux systems. Make ...