August 2018
Intermediate to advanced
227 pages
4h 16m
Chinese
Content preview from 高效R语言编程
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高效安装
｜
23
软件要求
本章仅需要安装一个包：
library ("benchmarkme")
高效
R
配置的
5
个高级技巧
1.
使用系统监视来识别硬件
/
代码的瓶颈。
2.
确保你的
R
安装和包是最新版本。
3.
充分利用
RStudio
的强大自动完成功能和快捷键。
4.
在
.Renviron
文件中保存
API
密钥。
5.
考虑改变你的
BLAS
库。
操作系统
R
支持三大主流操作系统：
Linux
、
Mac
和
Windows
注
1
。尽管存在操作系统
间的差异，比如说文件路径的标识问题（参见“启动文件位置”一节），但
R
语言是跨平台的。
R
语言可通过
Sys.info() 查看操作系统的相关信息：
Sys.info()
#> sysname release machine user
#> "Linux" "4.2.0-35-generic" "x86_64" "robin"
解释一下，上述输出是指
R
运行在
64
位（
X86_64
）、
Linux
系统
（4.2.0-35-generic 是
Linux
版本）及当前用户是 robin。该命令输出的其
他
4
部分信息（未列出）可在
R
控制台通过 ?Sys.info 显示帮助文件以查看
其具体含义。
注
1
：
所有的
CRAN
包自动测试除了
Solaris
以外的操作系统环境。据报道，
R
也可在非主流
的系统下运行，包括智能手机和游戏平台上（
Peng 2014
）。
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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.