Linux 如何在文件中为 R 编写和执行 hello world 程序？
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How to write and execute a hello world program in file for R?
提问by Aquarius_Girl
I did look in here: http://cran.r-project.org/doc/FAQ/R-FAQ.html#R-Programming
我确实在这里查看过：http: //cran.r-project.org/doc/FAQ/R-FAQ.html#R-Programming
Wikipedia shows how to write an on the fly R program: http://en.wikipedia.org/wiki/Hello_world_program_examples#R_2
维基百科展示了如何编写动态 R 程序：http: //en.wikipedia.org/wiki/Hello_world_program_examples#R_2
But how to execute this from a file?
What extension needs to be given?
How to compile the file then?
但是如何从文件中执行它呢？
需要提供什么扩展？
那怎么编译文件呢？
on Linux.
在 Linux 上。
I created a file mow.Rcontaining the following code:cat ('Hello world!')
我创建了一个mow.R包含以下代码的文件：cat ('Hello world!')
R says:
R 说：
> source mow.R
Error: unexpected symbol in "source mow.R"
采纳答案by Levon
I general you want to give your R files the .Rextension.
我一般你想给你的 R 文件.R扩展名。
To run a program you can start R (by typing "R" at the command prompt) and once inside the program/interpreter, you can execute your program (let's call it "so.R") with the source command. E.g.,
要运行程序，您可以启动 R（在命令提示符下键入“R”），一旦进入程序/解释器，您就可以"so.R"使用源命令执行您的程序（我们称之为）。例如，
> source('so.R')
yields:
产量：
Hello World
You can run the program from the Unix shell with
您可以从 Unix shell 运行该程序
R CMD BATCH so.R
it will generate a file named "so.Rout"that will contain the output of your program run, especially if it contains non-trivial amounts of output. If there is a problem with the program run, the error messages etc will also be in this file so it's a good diagnostic tool. An alternative is the Rscriptcommand which sends its output to stdout, in which case if it's long you need to capture it yourself.
它将生成一个名为的文件"so.Rout"，该文件将包含程序运行的输出，特别是如果它包含非平凡的输出量。如果程序运行出现问题，错误消息等也将在此文件中，因此它是一个很好的诊断工具。另一种选择是Rscript命令，它将其输出发送到 stdout，在这种情况下，如果它很长，您需要自己捕获它。
There is a very useful trick, when googling for R related topics it can be tricky because R is a single character. To be effective, pre-pend "r-help:" to your search terms. E.g.,
有一个非常有用的技巧，当在谷歌上搜索 R 相关主题时，它可能会很棘手，因为 R 是单个字符。为有效起见，请在您的搜索词前加上“ r-help:”。例如，
r-help:Running a program
r-help:Running a program
Here are two manuals that might be useful/help you get started:
以下是两本可能对您有用/帮助您入门的手册：
and also take a look at The R Manuals.
并查看The R Manuals。
More information/FAQs, etc., can be found at the R web siteitself. I have found that there is a lotof information on R (esp tutorials etc), but it can be tricky to find them. The "r-help" google trick really helps with this.
更多信息/常见问题等，可以在R 网站本身找到。我发现有很多关于 R 的信息（尤其是教程等），但要找到它们可能很棘手。“r-help”谷歌技巧确实对此有所帮助。
回答by johannes
You could also try:
你也可以试试：
Rscript mow.R
to get output on the console.
在控制台上获取输出。
