Question

我想将一个R脚本运行到eclipse中。

R 3.1.1
Ubuntu 12.04
Eclipse Kepler
Jars：
- JRI.jar
- REngine.jar
- RserveEngine.jar
环境（运行 - ＆gt;运行配置 - ＆gt;环境）
- R_HOME：/ usr / local / lib / R

代码：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import org.rosuda.REngine.REXP;
import org.rosuda.REngine.REXPMismatchException;
import org.rosuda.REngine.Rserve.RConnection;
import org.rosuda.REngine.Rserve.RserveException;
import org.rosuda.JRI.Rengine;

public class HelloWorldApp {

    public static void main(String[] args) throws RserveException, REXPMismatchException, FileNotFoundException, IOException {
        RConnection c = new RConnection("localhost",6311);
        if(c.isConnected()) {
            System.out.println("Connected to RServe.");
            if(c.needLogin()) {
                System.out.println("Providing Login");
                c.login("username", "password");
            }

            REXP x = c.eval("1:10");
            for(int i=0;i < x.length();i++)
            {
                System.out.println(x.asIntegers()[i]);
            }
            System.out.println("Reading script...");
            Rengine r = new Rengine(args, true, null);

            r.eval(" plot (x");            

        } else {
            System.out.println("Rserve could not connect");
        }

        c.close();
        System.out.println("Session Closed");
    }

}

输出：

Connected to RServe.

1

2

3

4

5

6

7

8

9

10

Reading script...

Fatal error: you must specify '--save', '--no-save' or '--vanilla'

Rstudio中发生了同样的错误：

library("Rserve")
Rserve()

输出：

Starting Rserve:
/usr/local/lib/R/bin/R CMD /home/mansi/R/x86_64-unknown-linux-gnu-library/3.1/Rserve/libs//Rserve 
Fatal error: you must specify '--save', '--no-save' or '--vanilla'

所以请帮我解决这个致命的错误。

Answer 1

Try: Rserve(args='--vanilla')

我遇到了同样的问题，这对我有用。

Answer 2

您可以使用rJava包附带的JRI而不是RServe。

在我看来，JRI比RServe更好，因为它不是创建一个单独的进程，而是使用本机调用来集成Java和R.

使用JRI，您不必担心端口，连接，监视器等...对R的调用是使用操作系统库（libjri）完成的。

这些方法与RServe非常相似，您仍然可以使用REXP对象。

有一个例子：

public void testMeanFunction() {

    // just making sure we have the right version of everything
    if (!Rengine.versionCheck()) {
        System.err.println("** Version mismatch - Java files don't match library version.");
        fail(String.format("Invalid versions. Rengine must have the same version of native library. Rengine version: %d. RNI library version: %d", Rengine.getVersion(), Rengine.rniGetVersion()));
    }

    // Enables debug traces
    Rengine.DEBUG = 1;

    System.out.println("Creating Rengine (with arguments)");
    // 1) we pass the arguments from the command line
    // 2) we won't use the main loop at first, we'll start it later
    // (that's the "false" as second argument)
    // 3) no callback class will be used
    engine = REngine.engineForClass("org.rosuda.REngine.JRI.JRIEngine", new String[] { "--no-save" }, null, false);
    System.out.println("Rengine created...");

    engine.parseAndEval("rVector=c(1,2,3,4,5)");
    REXP result = engine.parseAndEval("meanVal=mean(rVector)");
    // generic vectors are RVector to accomodate names
    assertThat(result.asDouble()).isEqualTo(3.0);
}

我有一个演示项目，它公开了一个REST API并使用这个包来调用R函数。

看看：https://github.com/jfcorugedo/RJavaServer

Rserve安装错误

2 个答案: