设置R下载镜像

进入R编辑环境，输入如下代码，设置清华镜像。

R version 4.0.3 (2020-10-10) -- "Bunny-Wunnies Freak Out"
Copyright (C) 2020 The R Foundation for Statistical Computing
Platform: x86_64-conda-linux-gnu (64-bit)

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>local(
	{
    
    
		r <- getOption("repos")
		r["CRAN"] <- "http://mirrors.tuna.tsinghua.edu.cn/CRAN/"
		options(repos=r)
	}
)

#local({r <- getOption("repos");r["CRAN"] <- "http://mirrors.tuna.tsinghua.edu.cn/CRAN/";options(repos=r)})