[R] calling R from within Java, using jri

[john.gavin at ubs.com]

Hi,

(I addressed the JRI issues I had in my previous email below
http://article.gmane.org/gmane.comp.lang.r.general/70322
by working with the precompiled version of JRI 
that is part of the rJava package.)

So I can now run the JRI examples as expected but am having difficulty
getting the Rengine to start with the '--vanilla' startup option set.
When I run JRI's rtest example with the '--vanilla' argument set,
it seems to have no effect but on the command line (inside rtest)
I can see that the command line option was issued as expected:

> commandArgs() 
rBusy(1) 
[1] "Rengine"   "--vanilla" 
rBusy(0) 
> 

In addition, adding the line

  System.out.println("Print arguments " + args[0]); 

just before passing the 'args' to the Rengine

  Rengine re=new Rengine(args, false, new TextConsole()); 

produces the expected output 'Print arguments --vanilla'.

So what is the correct way to get Rengine to accept the '--vanilla'
argument?

Regards,

John.

John Gavin <john.gavin at ubs.com>,
Commodities, FIRC,
UBS Investment Bank, 2nd floor, 
100 Liverpool St., London EC2M 2RH, UK.
Phone +44 (0) 207 567 4289

> -----Original Message-----
> From: Gavin, John 
> Sent: 28 September 2006 12:42
> To: 'R-help at stat.math.ethz.ch'
> Subject: calling R from within Java, using jri
> 
> Hi,
> 
> I want to call R from within Java, using jri as per 
> http://www.rosuda.org/software/jri/
> So I am following the instructions in the README file for JRI 0.2-4.
> 
> I have run 'sh configure.win' and 'make' and they seemed to 
> be successful.
> (See below for the output from make, for example.)
> But when I try 'run.bat rtest' (with and without R command 
> line arguments)
> the output that I get is 
> 
> 'c:\temp\r\jri>C:/PROGRA~1/Java/JDK15~1.0_0/bin/java -cp 
> .;examples;src/JRI.jar rtest $* 
> Creating Rengine (with arguments)'
> 
> That suggests that it gets to line 60 in rtest.java then 
> stops on line 61, 
> without producing an error. Line 61 is
> 
> Rengine re=new Rengine(args, false, null);
> 
> so it seems that I am not able to construct an Rengine.
> Can someone suggest what I might try next to track down the 
> problem, please?
> 
> I am running Java JDK 1.5.0 and R 2.3.1 on Windows NT.
> 
> Regards,
> 
> John.
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