Question

我已经用Java编写了一个脚本，该脚本依靠rJava通过R执行代码。该脚本在OSX下工作，但是，它在Windows下返回以下错误：

org.rosuda.REngine.REngineEvalException: error during evaluation
    at org.rosuda.REngine.JRI.JRIEngine.eval(JRIEngine.java:283)
    at org.rosuda.REngine.REngine.parseAndEval(REngine.java:102)
    at org.rosuda.REngine.REngine.parseAndEval(REngine.java:108)
    at Test.plot_dataFrame(Test.java:90)
    at Test.main(Test.java:35)

我现在要花几个小时来调试此问题，我希望这里的某人可能有解决此问题的想法。

我的脚本：

import java.util.*;
import org.rosuda.REngine.*;

public class Test {

    public static void main(String args[])  {

        String yName = "value";
        String xName = "time";

        int N = 10;
        int K = 10;
        // generating x scale (equidistant here)
        double[] xData = numbers1ToN(N);
        // generating random data for this example
        double[] DAX = cumSum(randomArray(N, K));
        double[] MDax = cumSum(randomArray(N, K));
        double[] cDAX = cumSum(randomArray(N, K));
        double[] TecDax = cumSum(randomArray(N, K));

        // filling data into a list of double[] and storing their tags
        List<double[]> yData = Arrays.asList(DAX, MDax, cDAX, TecDax);
        List<String> classNames = Arrays.asList("DAX", "MDax", "cDAX", "TecDax");

        int[] saveSize = new int[] {10, 10};
        String path = // On Windows path to Desktop, on mac path to external drive

        plot_dataFrame (path, saveSize, xName, xData, yName, yData, classNames, true, true);
    }

    private static void plot_dataFrame(String path, int[] saveSize, String xName, double[] xData, String yName, List<double[]> yData, List<String> classNames, boolean plot_points, boolean plot_lines) {
        REngine re;
        try {
            re = REngine.engineForClass("org.rosuda.REngine.JRI.JRIEngine", new String[] { "--vanilla" }, null, false);

            REXP df = null;
            try {
                REXP[] data = new REXP[yData.size() + 1];

                data[0] = new REXPDouble(xData);
                for (int i = 1; i < data.length; i++) {

                    data[i] = new REXPDouble(yData.get(i - 1));
                }

                List<String> nameList = new ArrayList<>(classNames);
                nameList.add(0, xName);

                df = REXP.createDataFrame(new RList(data, nameList.toArray(new String[0])));
            } catch (REXPMismatchException e) {
                e.printStackTrace();
            }

            re.assign("df", df);
            re.assign("path", path);
            re.assign("yName", yName);
            re.assign("xName", xName);
            re.assign("saveWidth", Integer.toString(saveSize[1]));
            re.assign("saveHeight", Integer.toString(saveSize[0]));

            re.parseAndEval("require(ggplot2)");
            re.parseAndEval("require(reshape2)");

            re.parseAndEval("df <- melt(df, id.vars = xName, variable.name = 'class', value.name = yName)");

            re.parseAndEval("figure <- ggplot(df, aes_string(x = xName, y = yName))");
            if (plot_points) re.parseAndEval("figure <- figure + geom_point(aes(colour = factor(class))) ");
            if (plot_lines) re.parseAndEval("figure <- figure + geom_line(aes(colour = class))  ");

            re.parseAndEval("ggsave(figure, file=path, width=as.numeric(saveWidth), height=as.numeric(saveHeight))");

            re.close();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    private static double[] numbers1ToN(int N) {
        double[] var = new double[N];
        for (int i = 1; i <= N; ++i) {
            var[i - 1] = (double) i;
        }
        return var;
    }

    private static double[] cumSum(double[] array) {

        for (int i = 1; i < array.length; i++) {
            array[i] += array[i - 1];
        }

        return array;
    }

    private static double randomFill(int K) {
        Random rand = new Random();
        return rand.nextInt(K);
    }
}

让我感到困扰的是，完全相同的代码在Mac上评估时没有问题。我尝试按照以下步骤在OSX上复制Java / R设置：

我安装了R（64位），安装了Java（64位），并在R下安装了与软件包相同的rJava（0.9-10）版本。我在下面将JAVA_HOME（C：\ Program Files \ Java \ jdk1.8.0_201）设置为Windows的系统变量并将rJava程序包加载到R中->在R中成功执行Java代码
此后，我安装了Eclipse，并从R的程序包位置（C：\ Users \ USER \）将JRI.jar，JRIEngine.jar和REngine.jar作为库添加到项目（项目/属性/ java构建路径/库）。 Documents \ R \ win-library \ 3.5 \ rJava \ jri）-> Java中的R执行失败：“找不到JRI本机库！”
设置运行配置：
- VM参数：“-Djava.library.path = C：\ Users \ USER \ Documents \ R \ win-library \ 3.5 \ rJava \ jri”
- 环境变量：路径= C：\ Program Files \ Java \ jre1.8.0_201 \ bin; C：\ Program Files \ R \ R-3.5.2 \ bin \ x64; C：\ Users \ USER \ Documents \ R \ win-library \ 3.5 \ rJava \ jri \ x64

现在，我被困在这一点上。 Java似乎找到了JRI本机库并尝试执行该代码，但是，在遵循在我的其他系统上运行并生成图像的相同指令时，它却失败了。由此产生的错误，您可以在本文开头找到。

这里有人知道我可能会缺少什么吗？非常感谢您的投入！

在Java下使用rJava会导致“评估时出错”

0 个答案: