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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基础知识
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53
按 Shift+Ctrl+N（Windows）或 Shift+Cmd+N（Mac）。
执行编辑器窗口中的某一行命令
将光标定位到需要执行的那一行命令上，按 Ctrl+Enter（ Windows）或 Cmd+Enter
（Mac）执行。
执行编辑器窗口中的多行命令
用鼠标选中需要执行的命令，然后按 Ctrl+Enter（ Windows）或 Cmd+Enter（Mac）
执行。
执行编辑器窗口中的全部命令
按 Ctrl+Alt+R（Windows）或 Cmd+Opt+R（Mac）执行编辑器窗口中的所有命令。
或者从菜单中单击“代码”（Code）→“运行区域”（Run Region）→“全部运行”
（Run All）。
可以通过选择“工具”（Tools）→“键盘快捷键帮助”（Keyboard Shortcuts Help）菜单项
在 RStudio 中找到这些键盘快捷键和其他几个键盘快捷键。
在编辑器窗口中从控制台窗口重现命令行只是复制和粘贴的问题。退出 RStudio 时，它
会询问是否要保存新脚本。你可以保存它以备将来重新使用，也可以丢弃它。
2.13 创建函数调用的管道
2.13.1 问题
在代码中创建许多中间变量不仅烦琐而且过于冗长，而嵌套 R 函数使得代码几乎不可读。
2.13.2 解决方案
使用管道运算符（％ >％）使表达式更易于读写。由 Stefan Bache 创建并在 magrittr
包中找到的管道运算符，也广泛用于许多 tidyverse 函数。
使用管道运算符将多个函数组合成一个没有中间变量的函数“管道” ...
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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.