2019-12-31
2019-12-31 本文已影响0人
南之绿桑
Warning: unable to access index for repository https://mirrors.tuna.tsinghua.edu.cn/CRAN/src/contrib:
cannot open URL 'https://mirrors.tuna.tsinghua.edu.cn/CRAN/src/contrib/PACKAGES'
Warning message:
package ‘devtools’ is not available (for R version 3.6.2)
