如何在R的文件中编写和执行Hello World程序? [英] How to write and execute a hello world program in file for R?
问题描述
我确实在这里查看: http://cran.r-project.org/doc/FAQ/R-FAQ.html#R-Programming
Wikipedia显示了如何实时编写R程序: http://en.wikipedia. org/wiki/Hello_world_program_examples#R_2
Wikipedia shows how to write an on the fly R program: http://en.wikipedia.org/wiki/Hello_world_program_examples#R_2
但是如何从文件执行此操作?
需要给出什么扩展名?
那么如何编译文件?
But how to execute this from a file?
What extension needs to be given?
How to compile the file then?
在Linux上.
我创建了一个文件mow.R，其中包含以下代码:
cat ('Hello world!')
I created a file mow.R containing the following code:
cat ('Hello world!')
R说:
> source mow.R
Error: unexpected symbol in "source mow.R"
推荐答案
通常，您希望为R文件提供.R扩展名.
I general you want to give your R files the .R extension.
要运行程序，您可以启动R(通过在命令提示符下键入"R")，并且一旦进入程序/解释器，就可以使用source命令执行程序(将其称为"so.R").例如，
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.,
> source('so.R')
产量:
Hello World
您可以使用以下命令从Unix shell运行程序:
You can run the program from the Unix shell with
R CMD BATCH so.R
它将生成一个名为"so.Rout"的文件，该文件将包含程序运行的输出，尤其是如果它包含大量的输出时.如果程序运行有问题，则此文件中也将包含错误消息等，因此它是一个很好的诊断工具.另一种方法是 Rscript 命令，该命令将其输出发送到stdout，在这种情况下，如果它很长您需要自己捕获它.
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 Rscript command which sends its output to stdout, in which case if it's long you need to capture it yourself.
有一个非常有用的技巧，在搜索R相关主题时可能会很棘手，因为R是单个字符.为有效起见，请在搜索词前添加" r-help:".例如，
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.,
r-help:Running a program
以下两本手册可能对您入门很有帮助/帮助:
Here are two manuals that might be useful/help you get started:
- Introduction to R
- Programming in R
并查看 R手册.
更多信息/常见问题等，可以在 R网站本身中找到.我发现R上有很多信息(esp教程等)，但是很难找到它们. Google的"r-help"技巧确实可以解决这个问题.
More information/FAQs, etc., can be found at the R web site itself. I have found that there is a lot of information on R (esp tutorials etc), but it can be tricky to find them. The "r-help" google trick really helps with this.
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