2014-01-27 117 views
2

我試圖通過Java程序與R一起工作。我首先在JRI上工作了一段時間,然而在回到Java程序之前,您必須完成R中所需的所有工作,這讓我看到了Rserve。通過Java程序與R交互

我似乎也遇到了Rserve的問題。我附加了我編寫的RserveTool,並試圖在主要方法中使用它來測試它。

import java.io.File; 
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; 

public class RserveTool { 

private RConnection _r; 
private Process _p; 

public RserveTool() { 

    System.out.println("Creating R Connection."); 

    _p = null; 
    try { 
     _p = Runtime.getRuntime().exec("Rserve.exe", null, new File("C:\\Program Files\\R\\R-3.0.2\\bin\\x64\\")); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    try { 
     _r = new RConnection(); 
     REXP x = _r.eval("R.version.string"); 
     System.out.println("Connection built to: " + x.asString()); 
    } catch (RserveException e) { 
     e.printStackTrace(); 
    } catch (REXPMismatchException e) { 
     e.printStackTrace(); 
    } 

} 

public void endRserveProcess() { 
    _p.destroy(); 
} 

public REXP readInCSVData(File csvFile, String dataVariableName, boolean isHeaderInData) throws RserveException { 

    String fileLocation = csvFile.getAbsolutePath(); 
    return _r.eval(dataVariableName + "<-read.csv('"+fileLocation+"', header=" +String.valueOf(isHeaderInData).toUpperCase() + ")"); 

} 

public REXP evalData(String dataVariableName) throws RserveException { 
    return _r.eval(dataVariableName); 
} 

public REXP attachData(String dataVariableName) throws RserveException { 
    return _r.eval("attach("+dataVariableName+")"); 
} 

public REXP runMultiLinearRegression(String responseVariableName, String[] variablesToRegressUpon, String dataVariableName) throws RserveException { 
    String insidelm = responseVariableName; 
    for(int i=0; i<variablesToRegressUpon.length; i++) { 
     if(i==0) { 
      insidelm+="~"; 
     } else { 
      insidelm+="+"; 
     } 
     insidelm+=variablesToRegressUpon[i]; 
    } 
    insidelm+=", data = " + dataVariableName; 

    return _r.eval("results=lm("+insidelm+")"); 

} 

public REXP runSummaryOfMultiLinearRegression() throws RserveException { 
    return _r.eval("summary(results)"); 
} 

public double[] getPValuesFromRegression(int numTermsRun) throws RserveException { 
    REXP p = _r.eval("summary(results)"); 
    System.out.println(p); 

    double[] pValues = new double[numTermsRun+1]; 
//  for(int i=0; i<p.asVector().getNames().size(); i++) { 
//   if(p.asVector().getNames().get(i).equals("coefficients")) { 
//    REXP results = (REXP) p.asVector().get(i); 
//    System.out.println(p.asVector().get(i)); 
//    for(int j=0; j<=numTermsRun; j++) { 
//     pValues[j] = results.asDoubleArray()[3*(numTermsRun+1)+j]; 
//    } 
//   } 
//  } 

    return pValues; 

} 

} 

我得到以下例外。

java.net.SocketException: Connection reset 
at java.net.SocketInputStream.read(SocketInputStream.java:189) 
at java.net.SocketInputStream.read(SocketInputStream.java:121) 
at java.net.SocketInputStream.read(SocketInputStream.java:107) 
at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:213) 
at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:180) 
at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:250) 
at org.rosuda.REngine.Rserve.RConnection.eval(RConnection.java:231) 
org.rosuda.REngine.Rserve.RserveException: eval failed 
at org.rosuda.REngine.Rserve.RConnection.eval(RConnection.java:234) 

任何幫助都將不勝感激。對格式問題感到抱歉,我是新手!

+0

'_p.waitFor()'試圖EVAL任何東西之前?你有一個非常有用的名爲[Rsession]的包裝器(http://code.google.com/p/rsession/),可以幫助安全地做到這一點,並小心處理Windows案例(這個過時的操作系統無法分叉進程) - 從'newInstanceTry(...)'函數中查看或獲取靈感。 –

回答

0

運行您的Java應用程序之前。你嘗試運行Rserve第一即R中

1)庫( 「Rserve」)2)Rserve()