June 2020
Beginner to intermediate
522 pages
9h 6m
Chinese
Content preview from R 语言经典实例（原书第 2 版）
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R
软件导览
｜
81
•
Linux 或 Unix
> Sys.getenv("R_HOME")
[1] "/usr/lib/R"
Windows 系统中的结果看起来似乎很古怪，因为 R 返回的是旧的 DOS 风格形式的压缩路径
名。在这种情况下，完整的用户友好的路径名应该是 C\Program Files\R\R-3.4.4。
在 Unix 和 macOS 上，可以从 shell 运行 R 程序并使用 RHOME 子命令显示主目录地址：
R RHOME
# /usr/lib/R
请注意，R 在 Unix 和 macOS 上的主目录中包含安装文件，但不一定包含 R 的可执行文
件。例如，R 主目录是
/usr/lib/R
，而可执行文件可能存放于
/usr/bin
目录中。
3.16 R 的自定义
3.16.1 问题
你希望通过改变配置选项或预加载 R 包，来客户化 R 进程。
3.16.2 解决方案
建立名为
.Rprofile
的脚本文件来对 R 进程进行自定义，R 会在启动时执行该文件。不同
操作系统的
.Rprofile
文件存放位置有所不同：
macOS、Linux 或 Unix
文件保存于主目录中（
~/.Rprofile
）。
Windows
文件保存于
Document s
中。
3.16.3 讨论
R 在启动时会执行配置脚本文件（
.Rprofile
），允许你调整 R 配置选项。
可以创建名为
.Rprofile
的配置脚本文件，并将其放在主目录（macOS、Linux，Unix），
或
Documents
目录（Windows）中。该脚本可以调用函数 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.