在 Java 中使用 R 编程
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using R programming in java
提问by Prashant
We are working on a complex statistical project on Java. We did the original code in the R programming language. Is there a way to convert this code to Javacode (converter) or otherwise how can we use Rin a Javaproject?
我们正在开展一个复杂的统计项目Java。我们用R 编程语言编写了原始代码。有没有办法将此代码转换为Java代码（转换器）或者我们如何R在Java项目中使用？
回答by Seidr
While I'm unaware of a 'converter', there is an interface called rJava which will allow you to run R code directly from Java.
虽然我不知道“转换器”，但有一个名为 rJava 的接口，它允许您直接从 Java 运行 R 代码。
rJava is a simple R-to-Java interface. It is comparable to the .C/.Call C interface. rJava provides a low-level bridge between R and Java (via JNI). It allows to create objects, call methods and access fields of Java objects from R.
In a sense the inverse of rJava is JRI (Java/R Interface) which provides the opposite direction - calling R from Java. JRI is now shipped as a part of the rJava package, although it still can be used as a separate entity (especially for development). Currently rJava is used as a part of JGR, iPlots and JavaGD software/packages.
rJava 是一个简单的 R 到 Java 接口。它类似于 .C/.Call C 接口。rJava 提供了 R 和 Java（通过 JNI）之间的低级桥梁。它允许从 R 创建对象、调用方法和访问 Java 对象的字段。
从某种意义上说，rJava 的逆是 JRI（Java/R 接口），它提供了相反的方向——从 Java 调用 R。JRI 现在作为 rJava 包的一部分提供，尽管它仍然可以用作单独的实体（特别是用于开发）。目前 rJava 被用作 JGR、iPlots 和 JavaGD 软件/包的一部分。
回答by Hymanson Cassimiro
You can try Renjin (http://www.renjin.org):
你可以试试人津（http://www.renjin.org）：
"Renjin is a JVM-based interpreter for the R language for statistical computing. This project is an initiative of BeDataDriven, a company providing consulting in analytics and decision support systems."
“Renjin 是用于统计计算的 R 语言的基于 JVM 的解释器。该项目是 BeDataDriven 的一项倡议，BeDataDriven 是一家提供分析和决策支持系统咨询的公司。”
回答by Venkat
As @Seidr said, using rJava we can run R code directly from Java methods.
正如@Seidr 所说，使用 rJava 我们可以直接从 Java 方法运行 R 代码。
Open R console and install rJava package
install.packages("rJava")Now you will find rJava in "R home\library"
Now in eclipse, add
JRI.jar,JRIEngine.jar,REngine.jarto project build path. These jars are available in "R home\library\rJava\jri"- Create Rengine object.
Now create two vectors, add them and store in another variable. Now print that result variable in console.
Rengine engine = new Rengine(new String[]{"--no-save"},false,null); String aVector = "c(1,2,3)"; String bVector = "c(4,5,6)"; engine.eval("a<-"+aVector); engine.eval("b<-"+bVector); engine.eval("c<-a+b"); System.out.println("Sum of two vectors : c = "+engine.eval("c"));
打开 R 控制台并安装 rJava 包
install.packages("rJava")现在你会在“ R home\library”中 找到rJava
现在在Eclipse中，加
JRI.jar，JRIEngine.jar，REngine.jar项目的构建路径。这些 jars 在“ R home\library\rJava\jri” 中可用- 创建 Rengine 对象。
现在创建两个向量，将它们相加并存储在另一个变量中。现在在控制台中打印结果变量。
Rengine engine = new Rengine(new String[]{"--no-save"},false,null); String aVector = "c(1,2,3)"; String bVector = "c(4,5,6)"; engine.eval("a<-"+aVector); engine.eval("b<-"+bVector); engine.eval("c<-a+b"); System.out.println("Sum of two vectors : c = "+engine.eval("c"));
Hope below link helps (step-by-step procedure to integrate R in Java).
希望下面的链接有帮助（在 Java 中集成 R 的分步过程）。
http://www.codophile.com/how-to-integrate-r-with-java-using-rjava/
http://www.codophile.com/how-to-integrate-r-with-java-using-rjava/
回答by Gleb Kosteiko
The another option to run R on JVM is FastR. According FastR's documentation:
在 JVM 上运行 R 的另一个选项是FastR。根据 FastR 的文档：
FastR is an implementation of the R Language in Java atop Truffle, a framework for building self-optimizing AST interpreters.
FastR is currently available in two forms:
- As a pre-built binary with the Truffle implementations of Ruby and JavaScript for Linux and Mac OS X. Unfortunately, there is no Windows version available yet.
- As a source release on GitHub. This option does not come with Ruby or JavaScript.
FastR 是在 Truffle 之上用 Java 实现的 R 语言，Truffle 是一个用于构建自我优化 AST 解释器的框架。
FastR 目前有两种形式：
- 作为 Linux 和 Mac OS X 的 Ruby 和 JavaScript 的 Truffle 实现的预构建二进制文件。不幸的是，目前还没有可用的 Windows 版本。
- 作为 GitHub 上的源代码发布。此选项不随 Ruby 或 JavaScript 提供。
