- [R从C - 尽可能简单的Helloworld [英] R from C -- Simplest Possible Helloworld

问题描述

这是用于开始第r间preTER，传递一个小的前pression（例如，2 + 2），并得到了结果的最简单的可能的C函数？我想使用MinGW编译在Windows上。

What is the simplest possible C function for starting the R interpreter, passing in a small expression (eg, 2+2), and getting out the result? I'm trying to compile with MingW on Windows.

推荐答案

您想从C调用R'

在该 8.1节看写R附加手册。你也应该看看进入测试目录（下载源代码包解压缩，你就会有测试目录）。类似的问题是previously问及R-帮助和的<​​a href =htt​​p://n4.nabble.com/Qs-on-calling-R-from-C-td923995.html相对=nofollow >这里是例子：

Look at section 8.1 in the Writing R Extensions manual. You should also look into the "tests" directory (download the source package extract it and you'll have the tests directory). A similar question was previously asked on R-Help and here was the example:

#include <Rinternals.h> 
#include <Rembedded.h> 

SEXP hello() { 
  return mkString("Hello, world!\n"); 
} 

int main(int argc, char **argv) { 
  SEXP x; 
  Rf_initEmbeddedR(argc, argv); 
  x = hello(); 
  return x == NULL;             /* i.e. 0 on success */ 
} 

从R手动的简单的例子是，像这样：

The simple example from the R manual is like so:

 #include <Rembedded.h>

 int main(int ac, char **av)
 {
     /* do some setup */
     Rf_initEmbeddedR(argc, argv);
     /* do some more setup */

     /* submit some code to R, which is done interactively via
         run_Rmainloop();

         A possible substitute for a pseudo-console is

         R_ReplDLLinit();
         while(R_ReplDLLdo1() > 0) {
           add user actions here if desired
         }
      */
     Rf_endEmbeddedR(0);
     /* final tidying up after R is shutdown */
     return 0;
 }

顺便说一句，你可能要考虑使用的 Ri​​nside 来代替：德克提供的一个很好的Hello World的例子中的项目主页。

Incidentally, you might want to consider using Rinside instead: Dirk provides a nice "hello world" example on the project homepage.

在你感兴趣的调用由R C，这是我原来的答复：

In you're interested in calling C from R, here's my original answer:

这是不完全的hello world，但这里有一些很好的资源：

This isn't exactly "hello world", but here are some good resources:

• 周杰伦艾默生最近给在纽约的用户群R上封装发展的谈话，他提供了使用C从内部R的一些非常好的例子看一看的从他的网站这次讨论中，开始第9页的纸张所有相关的源$ C ​​$ C是在这里：< A HREF =htt​​p://www.stat.yale.edu/~jay/Rmeetup/MyToolkitWithC/相对=nofollow> http://www.stat.yale.edu/~jay/Rmeetup/MyToolkitWithC/ 。


• 在哈佛受戈皮·哥斯瓦米在2005年讲授课程： C-C ++ - R（统计）。这包括大量的示例和源$ C ​​$ C。

• Jay Emerson recently gave a talk on R package development at the New York useR group, and he provided some very nice examples of using C from within R. Have a look at the paper from this discussion on his website, starting on page 9. All the related source code is here: http://www.stat.yale.edu/~jay/Rmeetup/MyToolkitWithC/.
• The course taught at Harvard by Gopi Goswami in 2005: C-C++-R (in Statistics). This includes extensive examples and source code.

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