我尝试使用命令install.packages(" dplyr")安装dplyr软件包。我得到以下错误。任何人都可以确定这里的问题是什么?我错过了吗?
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/src/contrib:
cannot open URL 'http://cran.rstudio.com/src/contrib/PACKAGES'
Installing package into ‘C:/Users/mani/Documents/R/win-library/3.4’
(as ‘lib’ is unspecified)
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/src/contrib:
cannot open URL 'http://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
package ‘dplyr’ is not available (for R version 3.4.0)
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
InternetOpenUrl failed: ' âˆû'
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.4:
cannot open URL 'http://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES'