> install.packages("dplyr")
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/DELL/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 ‘dplyr’ 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'
我的Windows系统是中文版本，但是我在官方网站上安装了Rstudio，也许Rstudio默认转换为中文版本？ 我无法安装任何软件包，它一直发出类似警告，然后我重新安装了三次，...有人可以帮助我吗？真的很感激。