Differ in Results between running and debugging the JAVA Program with Embedded R code

Question

The Code is below:

      RConnection connection = new RConnection();
        String load_pkgs = "require(Rserve); require(forecast)";
        connection.eval(load_pkgs);
        String strx1 = "xData = read.table(\"D:\\\\R_TESTS\\\\ts_interval_data21.csv\",sep=\"|\",header=FALSE,col.names=c(\"a\",\"b\",\"c\",\"d\",\"xData\",\"f\"))[,\"xData\",drop=FALSE]";
        connection.eval(strx1);
        String strx2 = "x = xData[1:100,1]; fit = auto.arima(x);";
        connection.eval(strx2);
        String strx3 = "result = forecast(fit,h=12);";
        connection.eval(strx3);
        Object result =       (Object)connection.eval("result").asNativeJavaObject();
        HashMap map  = (HashMap)result;
        List<Object> objects  = new ArrayList<Object>(map.keySet());
        double values[] = (double[])objects.get(4);
                  for(int i=0;i<values.length;i++)
        {
            System.out.println((i+1)+":"+values[i]);
        }

actually I'm running R inside the JAVA using Rserve() connection,now every thing works fine but when running the program the output will be totally wrong and while debugging the output is perfect. I'm not able to find the bug in my code please review the code and leave your suggestions. Thank You

I hope the following images will help:

1) Image depicts output in DEBUG mode

2) Image depicts the output in normal RUN mode

brijs · Accepted Answer · 2016-07-01 18:58:11Z

2

The reason behind this is the fundamental difference in Java and R storage types. As you can read in the following link: Documentation for asNativeObject() this function "tries" to convert R return-types to Java Object class. But this procedure is not successful every time. And thus I would suggest you not to use the asNativeObject() function. Try to find out a workaround using other functions.

The reason you see the difference is because the Java Object created in debug and run modes are different in their content and structure.

answered Jul 1, 2016 at 18:58

brijs

5457 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

balu Over a year ago

Thank you @Brijesh Kumar Sahoo

Collectives™ on Stack Overflow

Differ in Results between running and debugging the JAVA Program with Embedded R code

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related