Question

我是java和renjin的初学者。我需要在jtextpane中显示输出结果，我该怎么做？我太累了。如果你知道怎么做，请告诉我。感谢

RenjinScriptEngineFactory factory = new RenjinScriptEngineFactory();
        // create a Renjin engine:
        ScriptEngine engine = factory.getScriptEngine();

    try {
        //engine.eval("RealData <- read.csv('E:/R Project/Original Data Cleaning Data Historis.csv', header = TRUE)");                    
        engine.eval("RealData <- read.csv('"+textPath.getText().replace('\\','/')+"', header = TRUE)");                    
        //engine.eval("print(RealData)");
        engine.eval("library(e1071)");
        //engine.eval("tune.out <- tune(svm, hasil~., data=RealData, kernel=\"radial\",ranges = list(cost = c(1:10),gamma = c (1:4)))");
        //engine.eval("summary(tune.out)");
        engine.eval("svmfit <- svm(hasil~., data=RealData, kernel=\"radial\", cost=2, gamma=4)");

        editorSvm.setText(engine.eval("print(svmfit)").toString());


    } catch (ScriptException ex) {
        Logger.getLogger(Klasifikasi.class.getName()).log(Level.SEVERE, null, ex);
    }`

Answer 1

print.svm函数始终返回NULL，因此您无法通过查看print()的返回值来获得所需内容。

相反，print()函数会将文本写入ScriptEngine的标准输出流，默认情况下将其发送到进程＆＃39;标准输出流。

如[文档] [2]中所述，您可以通过以下方式将输出从R重定向到StringWriter：

StringWriter outputWriter = new StringWriter();   
engine.getContext().setWriter(outputWriter);
engine.eval("print(svmfit)");

String output = outputWriter.toString();

// Reset output to console
engine.getContext().setWriter(new PrintWriter(System.out));

print.svm函数的输出现在将存储在Java output变量中。

如何在java renjin的textpane上显示输出？

1 个答案: