R devel - Jul 2006 - Call R function from Java

Dear All,
   
  I need to call R functions from Java, I've read on the internet about JRI
but there are no exemples, neither tutorials.
  I'm beginner in Java and in R,
   
  Could you please help me??
   
  Thank you in advance,
   
  Xena 

 		
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On Jul 7, 2006, at 8:50 AM, zana adeb wrote:
> Dear All,
>
>   I need to call R functions from Java, I've read on the internet  
> about JRI but there are no exemples, neither tutorials.
There are some basic examples in JRI/examples

>   I'm beginner in Java and in R,
>
JRI is a low-level interface, so may need to learn more about R.  
However, the experimental JRI 0.3 is getting some higher-level API  
and is available from http://www.rosuda.org/R/nightly/

Cheers,
Simon

Hey guys,

It worked. All I had to do is set PATH = < R directory > in my system
variables in "My Computer" and that was it!

Oh btw Simon, I couldn't find the run.bat in the JRI_0.2-4.tar.gz file. I
found a "run.in" but that is a unix bash script.

Another question:

When I'm evaluating R expressions:
	REXP
rexp3=r.eval("cancer=read.table(\"CancerCellsTrainingFile.txt\",header=TRUE,
sep=\",\")");
	System.out.println(rexp3);

I sometimes get back form the println:
	RXP[unknown/19, id=1208787616, o=null]

Is there anyway to actually view that output as a string? I know it's not a
graphical object. It's probably a type of error message.

I'm running Windows XP, 1GB RAM, 2 x 1.8GHZ Xeon P4's, Eclipse 3.1.1,
jdk1.5.0_07, and jre1.5.0_06

Thanks,
Adam

-----Original Message-----
From: Simon Urbanek [mailto:simon.urbanek at r-project.org] 
Sent: Thursday, July 13, 2006 11:17 AM
To: way4thesub
Subject: Re: [Rd] Call R function from Java

Adam,

On Jul 12, 2006, at 10:42 PM, way4thesub wrote:
> I am unsure how to actually import JRI into eclipse.
I don't know either, but I'd recommend using the run.bat start script  
supplied with JRI. I bet Brian's guess is correct.

> I'm sorry this is such an easy question but with the lack of FAQ's
> and examples of JRI, I'm forced to ask it.
>
There are examples in JRI (in the "examples" directory) and JGR is  
probably the best example of the general use of JRI. At your  
suggestion I have now added a FAQ.

Cheers,
Simon

Hi,

i would like also to install JRI in Eclipse but it doesnt work.. 

 @way4thesub: can you please tell me how you did that?

thanks
sara
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RCaller is another way for calling r from java without JNI.
You can try and develop RCaller with GPL license.
http://www.mhsatman.com/rcaller

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