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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局选项”（Global Options）在 RStudio 中禁用此行为。我们建议你禁用此选项，始终
明确保存并加载你的工作。
4. 如果你定义了一个 .First 函数，R 将执行该函数。.First 函数是用户或项目定
义启动初始化代码的好地方。你可以在
.Rprofile
文件或工作空间中定义该函数。
5. R 执行 .First.sys 函数。这一步骤会加载默认包。该函数是 R 的内部函数，通常
不会被用户或管理员更改。
注意，R 直到最后一步执行 .First.sys 函数时才会加载默认 R 包。在此之前，只加
载了基础 R 包。这一点很重要，因为这意味着前面的步骤不能假设基础 R 包以外的软件
包会被载入。它还解释了为什么在
.Rprofile
脚本文件中尝试打开绘图窗口时会出错：因
为绘图 R 包尚未加载。
3.16.4 另请参阅
有关 Startup（ help(Startup)）和 Options（ help(options)）的内容，请参
阅 R 帮助页面。有关加载 R 包的更多信息，请参阅 3.8 节。
3.17 在云端使用 R 和 RStudio
3.17.1 问题
你希望在云环境运行 R 和 RStudio。
3.17.2 解决方案
在云端使用 R 的最直接方法是使用 RStudio.cloud 的 Web 服务。要使用该服务，请使
用 Web 浏览器前往
http://rstudio.cloud
并设置账户，或使用你的 Google 或 GitHub 账号
登录。
3.17.3
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.