From keithc.y.li at gmail.com  Fri Nov 19 19:40:54 2010
From: keithc.y.li at gmail.com (Keith)
Date: Fri, 19 Nov 2010 19:40:54 +0100
Subject: [Rd] JRI and error message from R_isMethodsDispatchOn
Message-ID: <4CE6C4B6.6030902@gmail.com>

Dear R users,

I have a small project written in Java and need some statical tools. 
Therefore, I used JRI (in rJava package) as an interface between R and 
Java to write some wrappers for my work. However, I received error 
message from R while I have more than one java method which wraps R:

Error in .Call("R_isMethodsDispatchOn", onOff, PACKAGE = "base") :
   Incorrect number of arguments (2), expecting 1 for R_isMethodsDispatchOn

The Java pseudo code would be like:

public class Test{
   public static void main(String[] args){
     ...
     objA.do;
     objB.do;
     ...
   }
}

Each do method actually calls R to do the job. I already know R is 
single-treaded so I implemented end method in Rengine class to shutdown 
R in each method. I thought this won't cause multi-thread problems in 
this case because I terminate/destroy each R thread before I call 
another one. But, it seems that it's still considered as 2 threads. Did 
I miss something? or probably, I have to set-up JRI server for my 
project? or other recommendations for my purpose?

R version: 2.11.1
rJava version: 0.8-4
OS: Arch Linux

Best,
Keith



[Rd] JRI and error message from R_isMethodsDispatchOn
Keith