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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图 1-1：在 macOS 中的 R 和 RStudio 图标
如果你单击 R 图标，你会看到类似图 1-2 所示的欢迎界面，这是 Mac 上的 R 基本版的
界面，但这肯定不是 RStudio 的界面。
图 1-2：macOS 中的 R 控制台
当你启动 RStudio 时，默认情况下它将打开你在 RStudio 中工作的最后一个项目。
1.4 输入 R 命令
1.4.1 问题
RStudio 软件启动以后，该如何进行下一步的操作？
R
入门和获得帮助
｜
15
1.4.2 解决方案
启动 RStudio 时，左侧的主窗口是 R 会话。从那里你可以直接以交互方式输入 R 命令。
1.4.3 讨论
R 软件采用 > 符号提示输入指令代码，可以将 R 简单看作一个能读取用户输入指令，运
行计算并显示结果的“大计算器”。如：
> 1 + 1
[1] 2
>
软件通过计算等式 1+1，得到结果为 2，并显示该结果。
2 之前的 [1] 有些令人困扰。R 软件始终以向量的形式输出结果，即使输出结果仅由一
个元素组成。在上式的输出中，2 之前的 [1]，表示 2 是这一输出向量中的第一个元素。
由于输出的向量
仅
由一个元素组成，因此这并不难理解。
在输入一个完整的表达式前，R 软件会不断通过 > 符号提示继续输入命令的余下部分。 ...
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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.