get character from r to java use rcaller

Question

The results in R is character or describe.I want to get the resule from R then into Java.I use RCaller.

I use the code below is not works.

    code.clear();

    code.addRCode("c1<-factor(describe(1:10)$counts)");
    code.addRCode("c2<-as.numeric(as.character(c1))");

    System.out.println(code.toString());

    caller.setRCode(code);
    caller.runAndReturnResultOnline("c2");


    // String[] cc = caller.getParser().getAsStringArray("de");
    double[] cc = caller.getParser().getAsDoubleArray("c2");
    System.out.println(caller.getParser().getClass());


    for (int i = 0; i < cc.length; i++) {
        System.out.println(cc[i]);
    }
}

But I use these below is working!

            code.clear();
    code.addRCode("c1<-factor(3.3:9.3)");
    code.addRCode("c2<-as.numeric(as.character(c1))");

    System.out.println(code.toString());

    caller.setRCode(code);
    caller.runAndReturnResultOnline("c2");


    // String[] cc = caller.getParser().getAsStringArray("de");
    double[] cc = caller.getParser().getAsDoubleArray("c2");
    System.out.println(caller.getParser().getClass());


    for (int i = 0; i < cc.length; i++) {
        System.out.println(cc[i]);
    }
}

why? If I want get character or other type data from R to Java use RCaller,what can I do?Thanks!!!

Answer 1

因为您使用getAsDoubleArray（）返回一个双精度数据类型的数组。