August 2018
Intermediate to advanced
227 pages
4h 16m
Chinese
Content preview from 高效R语言编程
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55
第
3
章
高效编程
很多
R
语言用户并不认为自己是程序员。他们往往精通专业领域知识，并理
解诸如向量和数据集等
R
语言的标准数据结构，但缺乏正规的编程方面的培
训。与你的状态很像吗？那么，本章很适合你。
本章，我们将讨论编程技巧的“蓝图”。在开始描述标准编程结构之前，
我们先讲述一般概念和有关代码优化的
R
编程技巧。本章最后，我们通过
compiler
包与多
CPU
的并行处理对代码加速做了对比分析。
软件要求（配置）
本章我们引入两个新包：
compiler
与
memoise
。
compiler
包在标准
R
中，所
以在安装
R
时，也就安装了
compiler
包。
library("compiler")
library("memoise")
在练习中，我们也使用了
pryr
包与
microbenchmark
包。
高效编程
5
个技巧
1.
小心，尽量不要增加向量的大小。
2.
尽可能向量化代码。
3.
适当时机下使用因子（
factor
）。
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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.