Question

I m passing multiple tab delim files into R via Java.The R programm merges those tab delim files as single file and sends back to java and it is captured in the variable “name”.Now I want to rename and save that file stored in “name” as tab delim using save dialog box in windows.Any help highly appreciated.Here is the java code:

import org.rosuda.REngine.*;

public class rjava {
    // Before this run Rserve() command in R


    public String ana(String filenames)
    {
        String name = "";
            try{

                System.out.println("INFO: Trying to connect to R ");
                RConnection c = new RConnection();
                System.out.println("INFO: Connected to R");
                System.out.println("INFO: The Server version is "+ c.getServerVersion());
            //  c.voidEval("source('D:/combine/combining_files.r')");
                c.voidEval("source('D:/combine/merge.r')");
                c.assign("file",filenames);
            //  name = (c.eval("fn(file)").asString());
                name = (c.eval("combine (file)").asString());
                c.close();
                }

    catch(Exception e)
    {
            System.out.println("ERROR: In Connection to R");
            System.out.println("The Exception is "+ e.getMessage());
            e.printStackTrace();
    }

    return name;
    }
}

Answer 1

I find passing complex objects between R and Java to be a pain the ass. I would not pass the full data, but rather would pass only file names as a string. Either have Java tell R to write out the new file (my pref) or have Java read in the file and then write out with a new name.