java - JRI和R-无法捕获输出

我正在尝试使用Java和R(JRI和Rengine)绘制一些图形。当我在代码中编写如下代码时，效果很好:

re.eval("plot(c(1,5,3,8,5), type='l', col=2)");

但是如果我这样写:

re.eval("source(\"C:\\Documents and Settings\\abc\\My Documents\\Test Data\\BoxPlot.r\");");

输出窗口闪烁片刻并消失。此指定文件仅包含一个命令，第一个命令即re.eval("plot(c(1,5,3,8,5), type='l', col=2)");
我对R非常陌生，所以这可能是一个非常基本的问题。但是我找不到它。谁能帮我吗？

谢谢。

编辑1

我正在使用Windows XP。

这是完整的代码:

import org.rosuda.JRI.Rengine;

public class JavaGDExample1 {

  public static void main(String[] args) {
    Rengine re;
    String[] dummyArgs = new String[1];
    dummyArgs[0] = "--vanilla";
    re = new Rengine(dummyArgs, false, null);
    re.eval("library(JavaGD)");

    // This is the critical line: Here, we tell R that the JavaGD() device that
    // it is supposed to draw to is implemented in the class MyJavaGD. If it were
    // in a package (say, my.package), this should be set to
    // my/package/MyJavaGD1.
    re.eval("Sys.putenv('JAVAGD_CLASS_NAME'='MyJavaGD1')");

    re.eval("JavaGD()");
//    re.eval("plot(c(1,5,3,8,5), type='l', col=2)");
    re.eval("source(\"C:\\Documents and Settings\\abc\\My Documents\\Test Data\\BoxPlot.r\");");
//    re.eval("source(\"C:\\Documents and Settings\\abc\\My Documents\\Test Data\\testPlot.r\")");
    re.end();
  }
}


import javax.swing.JFrame;

import org.rosuda.javaGD.GDCanvas;
import org.rosuda.javaGD.GDInterface;

/**
 * This is a minimal reimplementation of the GDInterface. When the device is opened,
 * it just creates a new JFrame, adds a new GDCanvas to it (R will plot to this GDCanvas)
 * and tells the program to exit when it is closed.
 */
public class MyJavaGD1 extends GDInterface {
  public JFrame f;

  public void gdOpen(double w, double h) {
    f = new JFrame("JavaGD");
    c = new GDCanvas(w, h);
    f.add((GDCanvas) c);
    f.pack();
    f.setVisible(true);
    f.setTitle("Naked R plot");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

}

最佳答案

您的路径错误-您正在输入引号 hell ，您发送给R的是

 source("C:\Documents and Settings\abc\My Documents\Test Data\BoxPlot.r");

这是无效的:

 > source("C:\Documents and Settings\abc\My Documents\Test Data\BoxPlot.r");
 Error: '\D' is an unrecognized escape in character string starting "C:\D"

为避免引号，指定文件名更安全:

 re.assign("fn", "c:\\foo\\bar");
 re.eval("source(fn)");

或使用/代替\\
PS:使用stats-rosuda-devel解决rJava / JRI问题