3.5.1版本這是什么錯誤？
Warning in install.packages :
? unable to access index for repository https://cran.rstudio.com/src/contrib:
? cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Installing package into ‘C:/Users/Andminstrator/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
Warning in install.packages :
? unable to access index for repository https://cran.rstudio.com/src/contrib:
? cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
? package ‘cerat’ is not available (for R version 3.5.1)
Warning in install.packages :
? unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.5:
? cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'
>?
2018-10-11
Warning in install.packages :
? unable to access index for repository http://mirror.lzu.edu.cn/CRAN/src/contrib
Warning in install.packages :
? unable to access index for repository http://mirror.lzu.edu.cn/CRAN/src/contrib
Warning in install.packages :
? package ‘caret’ is not available (for R version 3.2.1)
Warning in install.packages :
? unable to access index for repository http://mirror.lzu.edu.cn/CRAN/bin/windows/contrib/3.2
在WIN10 上? ?install.packages("caret")出現以下錯誤
2018-10-11
我的3.5.1也不能安裝caret這個包
2018-08-25
但是我前面也下過那個版本，但可以
2018-08-24
你是不是想安裝cerat這個包??？顯示在3.5.1這個版本中不存在此包