YGC

包不存在！镜像要不要背锅？

2 min read

一条指令装一下ggplot2，它竟然告诉我没这个包，这难道不是在欺负我？

> install.packages("ggplot2")
Installing package into ‘E:/software-data/RLibrary’
(as ‘lib’ is unspecified)
Warning: unable to access index for repository https://mirrors.ustc.edu.cn/CRAN/src/contrib:
  cannot open URL 'https://mirrors.ustc.edu.cn/CRAN/src/contrib/PACKAGES'
Warning: unable to access index for repository https://mirrors.ustc.edu.cn/CRAN/bin/windows/contrib/4.5:
  cannot open URL 'https://mirrors.ustc.edu.cn/CRAN/bin/windows/contrib/4.5/PACKAGES'
Warning message:
package ‘ggplot2’ is not available for this version of R
 
A version of this package for your version of R might be available elsewhere,
see the ideas at
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages

怀疑人生，想起我6年前写的魔镜mirrorselect包（电梯：《魔镜魔镜告诉你，它上CRAN了》），果断测速，换个镜像。

> mirrorselect::get_mirror('CRAN', 'cn') -> m
> head(m)
[1] "https://mirrors.tuna.tsinghua.edu.cn/CRAN/" "https://mirrors.bfsu.edu.cn/CRAN/"          "https://mirrors.pku.edu.cn/CRAN/"          
[4] "https://mirrors.ustc.edu.cn/CRAN/"          "https://mirrors.zju.edu.cn/CRAN/"           "https://mirrors.qlu.edu.cn/CRAN/"          
> length(m)
[1] 12
> mirrorselect::mirrorselect(m) -> st
> st
                                       mirror speed
1           https://mirrors.hust.edu.cn/CRAN/  0.13
2           https://mirrors.ustc.edu.cn/CRAN/  0.14
3        https://mirrors.sustech.edu.cn/CRAN/  0.14
4            https://mirrors.pku.edu.cn/CRAN/  0.18
5            https://mirrors.nju.edu.cn/CRAN/  0.23
6             https://mirror.lzu.edu.cn/CRAN/  0.26
7     https://mirrors.sjtug.sjtu.edu.cn/cran/  0.27
8          https://mirrors.nwafu.edu.cn/cran/  0.28
9            https://mirrors.zju.edu.cn/CRAN/  0.32
10           https://mirrors.qlu.edu.cn/CRAN/  0.41
11          https://mirrors.bfsu.edu.cn/CRAN/  0.53
12 https://mirrors.tuna.tsinghua.edu.cn/CRAN/  0.55

看上去华科最快，换上再试试，装包就丝滑了。

> options(repos = c(CRAN = "https://mirrors.hust.edu.cn/CRAN/"))
> install.packages("ggplot2")
Installing package into ‘E:/software-data/RLibrary’
(as ‘lib’ is unspecified)
trying URL 'https://mirrors.hust.edu.cn/CRAN/bin/windows/contrib/4.5/ggplot2_3.5.2.zip'
Content type 'application/zip' length 5016803 bytes (4.8 MB)
downloaded 4.8 MB
 
package ‘ggplot2’ successfully unpacked and MD5 sums checked
 
The downloaded binary packages are in
        C:\Users\HUAWEI\AppData\Local\Temp\RtmpS8YcTh\downloaded_packages

CRAN包，用install.packages("mirrorselect")就可以安装，让你下包接上大水管。

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