August 2018
Intermediate to advanced
227 pages
4h 16m
Chinese
Content preview from 高效R语言编程
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76
｜
第
3
章
## Windows
用户需要
Rtools
install.packages("ggplot2", type = "source")
或者，如果我们不想改变
.
Renviron
文件，我们可指定另外一个参数：
install.packages("ggplot2", type = "source", INSTALL_opts = "--byte-compile")
最后一个选项是实时编译（
JIT
）
注
2
。如参数为
0
，enableJIT() 函数关闭
JIT
优化，参数为
1
、
2
、
3
则实现不同等级的优化。将环境变量 R_ENABLE_
JIT 设置为上述的某个值，则可进行不同等级
JIT
优化。
我们推荐编译等级为最大值
3
。
安装编译对不同包的效果是不一样的。如果包中已经有大量预编译代码，速
度提升将不明显（
R Core Team 2016
）。
不是所有的包都是在安装时编译的。
参考文献
Burns, Patrick. 2011.
The R Inferno
. Lulu.com.
Wickham, Hadley. 2014a.
Advanced R
. CRC Press.
Grolemund, G., and H. Wickham. 2016.
R for Data Science
. O
’
Reilly Media.
R Core Team. 2016.
“
R Installation and Administration
”
R Foundation for
Statistical Computing
.
https://cran.r-pr ...
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