R - 无法访问包安装的URL

Question

我最近在个人计算机(Windows 8)上安装了R Studio(版本0.99.892),并尝试安装以下软件包:ggplot2; dplyr; rmarkdown; tidyr.

R和R Studio都无法安装任何这些软件包.每次我尝试安装软件包时,都会收到我在此帖子底部包含的警告集.

我使用了install.packages命令以及内置包安装工具.我尝试了几种不同的镜子.

我曾尝试过公立大学的互联网资源,我自己的私人互联网资源和电话系绳.我试图通过VPN连接.我已将R Studio添加到我的Windows防火墙例外列表中,并且还完全禁用了Windows防火墙.我没有运行其他防火墙.

我已切换全局选项中"包"选项卡中的各种连接选项.

我可以在浏览器中访问URL.

以下是R Studio的警告:

> install.packages("devtools")
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  unable to access index for repository https://cran.fhcrc.org/src/contrib:
  cannot open URL 'https://cran.fhcrc.org/src/contrib/PACKAGES'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be     resolved'
Warning in install.packages :
  unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
Installing package into ‘C:/Users/Nikhailovich/Documents/R/win-library/3.2’
(as ‘lib’ is unspecified)
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  unable to access index for repository https://cran.fhcrc.org/src/contrib:
  cannot open URL 'https://cran.fhcrc.org/src/contrib/PACKAGES'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
Warning in install.packages :
  package ‘devtools’ is not available (for R version 3.2.3)
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  unable to access index for repository https://cran.fhcrc.org/bin/windows/contrib/3.2:
  cannot open URL 'https://cran.fhcrc.org/bin/windows/contrib/3.2/PACKAGES'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning in install.packages :
  unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2/PACKAGES'

以下是R(3.2.3)的警告:

> install.packages("ggplot2")
Installing package into ‘C:/Users/Nikhailovich/Documents/R/win-library/3.2’
(as ‘lib’ is unspecified)
--- Please select a CRAN mirror for use in this session ---
Error in download.file(url, destfile = f, quiet = TRUE) : 
  cannot open URL 'https://cran.r-project.org/CRAN_mirrors.csv'
In addition: Warning message:
In download.file(url, destfile = f, quiet = TRUE) :
  InternetOpenUrl failed: 'The server name or address could not be resolved'
Warning: unable to access index for repository https://dirichlet.mat.puc.cl/src/contrib:
  cannot open URL 'https://dirichlet.mat.puc.cl/src/contrib/PACKAGES'
Warning: unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
Warning: unable to access index for repository https://dirichlet.mat.puc.cl/bin/windows/contrib/3.2:
  cannot open URL 'https://dirichlet.mat.puc.cl/bin/windows/contrib/3.2/PACKAGES'
Warning: unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2:
  cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2/PACKAGES'
Warning message:
package ‘ggplot2’ is not available (for R version 3.2.3) 

R和R Studio中的软件包安装上有几个stackexchange帖子,但是我无法找到任何能够解决我特定情况的帖子.提前感谢任何知道发生了什么的人

Answer 1

运行以下命令：

options(repos="https://CRAN.R-project.org")

之后尝试install.packages;它应该可以工作。在我的系统上测试。

Answer 2

这以前发生在我身上。尝试显式指定位置：

install.packages("devtools", repos="https://cran.rstudio.com/")