2013-6-24 Taiwan-useR-Group 報名網址：http://www.meetup.com/Taiwan-R/events/121977422/ FB粉絲團：https://www.facebook.com/Tw.R.User

1. rJava
Philipz

2. rJava
A simple R-to-Java interface.
From R to invoke Java Object,
instance, and method, then get the
value.
http://www.rforge.net/rJava/

3. How Use
library(rJava) and .jinit()
Class
pi <- J("java.lang.Math")
Instance
s <- .jnew("java/lang/String", "Hello World!")
Find Field
.jfield("java/lang/Boolean",, "TYPE")
Method
pi$ + TAB or names(pi) or .jmethods(pi)
.jcall(s,"I","length") or s$length()

4. Return Type

5. Demo
1. HelloJavaWorld
2. GUI - SWT
3. Send Email from R through
Java
4. Capital API
Design Pattern - singleton

6. Sorry

7. JRI
JRI is part of rJava.
From Java to invoke R library, R
function, and R interactive console.
http://www.rforge.net/JRI/

8. How Use
Import Jar libraries
http://www.rforge.net/JRI/files/
Set Path variable
Sys.getenv("Path") or
Java Run Environment Variables
R_HOME/R-3.0.0/bin/i386;R_HOMER-3.0.0libraryrJavajrii386
R_HOME/R-3.0.0/bin/x64;R_HOMER-3.0.0libraryrJavajrix64

9. Demo
1. R console
2. AWT GUI
3. High-level interactive
JRIEngine
4. Low-level interactive
Rengine

10. Reference
rJava
rJava Docs
Swing Example - Building a GUI from R
Creating R Packages: A Tutorial
Java JNI
JRI
JRI Javadoc

11. Thank you