math/R 3.1.2 をJava 1.8.0_25 から使う (MacOSX 10.10.1 + Homebrew 0.9.5 + Eclipse 4.4.1)

• Homebrew/r-command
  

  • $ brew tap homebrew/science

  • $ brew install r

  • $ R CMD javareconf JAVA_CPPFLAGS="-I/System/Library/Frameworks/JavaVM.framework/Headers -I/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk"

• Eclipse
  
  • Java Projectを作る
  • BuildPathに追加する
    

    • /usr/local/Cellar/r/3.1.2/R.framework/Versions/3.1/Resources/library/rJava/jri/JRI.jar

  • コードを追加する
    
    • src/rJava/RSample.java
      

      	package rJava;
      	import org.rosuda.JRI.REXP;
      	import org.rosuda.JRI.Rengine;
      	public class RSample {
      	public static void main(String[] args) {
      	System.err.println(System.getenv("R_HOME"));
      	System.err.println(System.getenv("java.library.path"));
      	Rengine engine = new Rengine(new String[] {
      	"--no-save"
      	}, false, null);
      	engine.assign("a", new int[] {
      	36
      	});
      	REXP result = engine.eval("sqrt(a)");
      	System.out.println(result.asDouble());
      	engine.end();
      	}
      	}

      view raw RSample.java hosted with ❤ by GitHub
      
      
  • 一度RSampleをJavaApplicationとして実行してしまって，JavaApplicationの実行パネルを作ってしまう
  • RunConfigureから上記で作成されたJavaApplicationのConfigureを選択し，以下を追加する
  • Argumentsタブ > "VM arguments:"

  • -Djava.library.path=.:/usr/local/Cellar/r/3.1.2/R.framework/Versions/3.1/Resources/library/rJava/jri

  • Environmentタブ > "Environment variables to set:"
  • Variable:

    R_HOME

  • Value:

    /usr/local/Cellar/r/3.1.2/R.framework/Versions/3.1/Resources

  • 再度RSampleを実行．

参考

• JavaからR言語を呼び出せる環境の構築 - Qiita