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
入门和获得帮助
｜
23
的 R 包未载入，你不知道哪个包中包含该函数。这有点类似于一个无法摆脱的困境
（catch-22，报错消息提示无法在搜索路径下找到该 R 包，因此 R 无法找到帮助文件；有
关详细信息，请参阅 3.6 节 ）。
解决方案是搜索所有已安装的添加包，来找到该函数。按错误信息中提示的方法来进行
搜索（即使用 help.search 函数），例如：
help.search("adf.test")?
搜索结果将生成包含该函数的所有 R 包的列表：
Help files with alias or concept or title matching 'adf.test' using
regular expression matching:
tseries::adf.test Augmented Dickey-Fuller Test
Type '?PKG::FOO' to inspect entry 'PKG::FOO TITLE'.
前面的输出表明 tseries 包中包含 adf.test 函数。可以再次使用 help 命令，在
help 的参数中明确指明，需要帮助文档的 R 函数所在的 R 包。例如：
help(adf.test, package = "tseries")
或者你可以使用双冒号运算符告诉 R 查看特定的 R 包：
?tseries::adf.test
你可以使用关键字扩大搜索范围。然后，R 将找到包含关键字的任何已安装文档。假设
你要查找含有 Augmented Dickey-Fuller ...
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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.