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
｜
31
设置之前，学会将其关闭是有必要的（例如为了调试）。
在
RStudio
中可交互式控制一些
R
的启动参数。详见在线帮助文件配置
RStudio
。
R
启动参数
有关启动的一些参数可添加到
R
启动命令中（当
R
运行在
shell
环境中）。下
面列举一些重要的参数
:
--no-environ
与
--no-init
通知
R
仅在当前工作目录下查找启动文件（下节将详述）。
--no-restore
通知
R
不加载可能存在于当前工作目录下的
.RData
（缺省
R
会话文件名）。
--no-save
通知
R
，当用户通过 q() 退出时，不询问是否要保存
RAM
中的对象。
上述任一参数的设置将稍微加快
R
的加载，意味着在退出时也较少有用户干
预。
R
默认加载最后一次会话的数据设置往往在当前会话中存在较多问题。
更多
R
启动参数内容详见附录
B
中的
R
概论。
实现前述功能的一个加载基础
R
的简易方法是：
R --vanilla
R
启动文件综述
每次
R
启动时将读入下列两个文件（只要上一节的命令行参数未被使用）：
.Renviron
本文件的首要目的是设置环境变量。这些变量通知
R
去何处查找程序，并
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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.