R 與其他語言的連結

訊息

從命令列呼叫 R 程式。

C:\Program Files\R\R-2.13.1\bin>R
> x=c(1,2,3)
> x
[1] 1 2 3
> q()
儲存工作空間圖案? [y/n/c]: n

C:\Program Files\R\R-2.13.1\bin>

如果要從命令列執行 R 程式，可以用下列方法。

檔案：d:\code\R\test.R

x=c(1,2,3)
x

執行命令：

C:\Program Files\R\R-2.13.1\bin>R --no-save < d:\code\R\test.R
> x=c(1,2,3)
> x
[1] 1 2 3
>

C:\Program Files\R\R-2.13.1\bin>

C:\Program Files\R\R-2.13.1\bin>R CMD BATCH --help
Usage: R CMD BATCH [options] infile [outfile]

Run R non-interactively with input from infile and place output (stdout
and stderr) to another file.  If not given, the name of the output file
is the one of the input file, with a possible '.R' extension stripped,
and '.Rout' appended.

Options:
  -h, --help            print short help message and exit
  -v, --version         print version info and exit
  --no-timing           do not report the timings
  --                    end processing of options

Further arguments starting with a '-' are considered as options as long
as '--' was not encountered, and are passed on to the R process, which
by default is started with '--restore --save'.

Report bugs to <r-bugs@r-project.org>.

C:\Program Files\R\R-2.13.1\bin>R CMD BATCH d:/code/R/test.R

結果可以在 D:\code\R 資料夾下看到一個 test.Rout 的檔案，內容如下：

> x=c(1,2,3)
> x
[1] 1 2 3
> 
> proc.time()
   user  system elapsed 
   0.40    0.06    0.43 
錯誤在gzfile(file, "wb") : 無法開啟連結
Calls: sys.save.image -> save.image -> save -> gzfile
此外: Warning message:
In gzfile(file, "wb") :
  cannot open compressed file '.RDataTmp', probable reason 'Permission denied'
停止執行
Warning message:
In file.remove(outfile) :
  cannot remove file '.RDataTmp', reason 'No such file or directory'

如果要用程式以命令列呼叫 R 程式，可以參考下列文章

資料來源：How to Run an R Script from the Command Line
- http://code.hammerpig.com/run-script-command-line.html

I’m writing this post because I just spent a couple of hours banging my head against the wall, trying to figure out how to run an R script from the command line. It was working if I simply ran it at the command line. But when I try to run the same command from Java (I know, this sounds convoluted) using the following code, it was behaving strangely and wasn’t executing. (錯誤方法)

Runtime r = Runtime.getRuntime();
r.exec("R CMD BATCH RScriptFile.R");

So I finally found out that there is a utility in R that is designed to help you execute scripts at the command line more easily. It’s called RScript. Now I’m doing it the following way, and it’s working beautifully. (正確方法)

Runtime r = Runtime.getRuntime();
r.exec("Rscript RScriptFile.R");

Seems obvious, but it wasn’t to me, and it took awhile to find an answer.

呼叫系統函數 (R 與外部程式)

相反的，如果要從 R 呼叫系統程式，可以參考下列文章：

https://sites.google.com/site/rprojectnotes/advanced_r/running_external_programs

Linux :

output <- system("ls", intern = TRUE)

MS. Windows :

shell("dir > c:/dir.txt")
shell.exec("c:/dir.txt")
shell.exec("http://sites.google.com/site/rprojectnotes/")

與 Python 連結

參看：统计学与R读书笔记第四版 — http://www.rproject.info/uploads/Site/R.pdf
1. Chapter 6 在python中调用R(rpy2)

與 Perl 連結

https://sites.google.com/site/rprojectnotes/advanced_r/r_and_perl

與 PHP 連結

https://sites.google.com/site/rprojectnotes/advanced_r/r_and_php

與 C 連結

https://sites.google.com/site/rprojectnotes/advanced_r/r_and_c

page revision: 8, last edited: 05 Sep 2011 07:19

Edit Rate (0) Tags Discuss (0) History Files Print Site tools + Options

金門大學：免費電子書、教材、程式、動畫

訊息