R包无法安装

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 :

  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 ‘BiocInstaller’ is not available (for R version 3.5.2)

Warning in install.packages :

  unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.5:

  cannot open URL 'http://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'

install.packages中的警告：

   无法访问存储库的索引http://cran.rstudio.com/src/contrib：

   无法打开网址'http://cran.rstudio.com/src/contrib/PACKAGES'

install.packages中的警告：

   无法访问存储库的索引http://cran.rstudio.com/src/contrib：

   无法打开网址'http://cran.rstudio.com/src/contrib/PACKAGES'

install.packages中的警告：

   包'BiocInstaller'不可用（对于R版本3.5.2）

install.packages中的警告：

   无法访问存储库的索引http://cran.rstudio.com/bin/windows/contrib/3.5：

   无法打开网址'http://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'

解决办法，翻墙，或者更改yum源

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