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View Code? Open in Web Editor NEWThe Omegahat interface for R and Java.
Home Page: http://www.omegahat.org/RSJava, http://www.omegahat.org
The Omegahat interface for R and Java.
Home Page: http://www.omegahat.org/RSJava, http://www.omegahat.org
This is an R package that allows users to create Java objects, invoke their methods and execute Omegahat expressions from the R language. This uses the embedded Omegahat interpreter to provide the Java access. Installation: ============ To install this R package, you can execute the command R INSTALL Java_0.51.tar.gz or R INSTALL Java The configure script attempts to locate the necessary tools, libraries, etc. on your system. It finds the Java installation in the following way. a) if you set the environment variable JAVA_HOME, it uses this to locate the java executable as ${JAVA_HOME}/bin/java, or b) if searches through the shell's path to find java and takes the first one. This requires Java 1.2, and also works for Java 1.3. Currently, this is known to work for the a) JDK 1.2 and 1.3 from Blackdown for Linux (http://www.blackdown.org), b) JDK 1.2 and 1.3 from Sun for Solaris (SunOS 5.6 and 5.7). c) JDK 1.3 from IBM for Linux (http://www.ibm.com/java/jdk) In the near future, we will attempt to support this on Windows. These are the only JDK implementations we have tried at this point. Please let us know if you have success or problems with other implementations and other platforms. Send mail to omega-devel@www.omegahat.org. We have encountered problems (i.e. crashes) under Blackdown's JDK1.2 for Linux when the graphics thread is created (i.e. when we create a GUI). This does not appear to happen under Solaris (JDK 1.3) or with the IBM JDK 1.3. Check: ===== The R CMD check is conceptually at odds with an inter-system interface such as this. First of all, one has to configure and initialize the JVM before running any of the examples. Secondly, the Java classpath for the examples may be different than for regular use. And finally, some of the examples are interactive in the form a GUI and will not return control until the user clicks on a button. Thus, don't run R CMD check (unless you have the appropriate startup file that initializes the JVM approriately.) Documentation: ============= The documentation for this package is very much a work in progress. There are help files for each of the functions. There is also a collection of documents that are installed in the Docs/ directory of the package. As the documentation evolves, updates will be available from http://www.omegahat.org/RSJava Example R scripts are installed in the examples/ directory. Bugs: ===== Please report bugs to the omega-bugs@www.omegahat.org list or use the Web-based bug reporting form at http://www.omegahat.org/omegahat-bugs Future plans: ============ The underlying Omegahat mechanism has a smart mechanism for allowing R functions and closures to implement Java interface classes. It does this by dynamically compiling and loading Java classes that make callbacks to the R engine. As more people use this package and the need for conversion are understood, this automatic conversion mechanism will be activated.
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