Proxy Rstudio包下载与代理连接问题

这两天我一直在网上寻找解决问题的方法，但都没有成功。 我在工作中下载了Rstudio，并尝试安装一些软件包

例如，当我在R中输入：

> install.packages("readxl")

它回来了

Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
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 :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
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 ‘readxl’ is not available (for R version 3.4.0)    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/src/contrib/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
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 :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
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 ‘readxl’ is not available (for R version 3.4.0)    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
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'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES.rds': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES.gz': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES': HTTP status was '407 Proxy Authorization Required'    
Warning in install.packages :
  unable to access index for repository http ://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4:
  cannot open URL 'http ://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.4/PACKAGES'

我在互联网上查看，问题似乎是连接到我公司的代理（每次连接到互联网时，我必须输入用户名和密码）

我试图在C:\Users\your user name\Documents中的.Renviron文件中添加我在internet上找到的以下代码：

options(internet.info = 0)   
http_proxy = https:// user_id:password@your_proxy:your_port    
http_proxy_user = user_id:password

我替换了用户id和密码
我在：start>run>cmd>ipconfig中找到了我的代理，它的格式是xxxxx.xxx.ca（一些字母替换了“x”）
我的端口是8080

我还尝试直接下载包的zip文件，但也不起作用

---

我非常想找到一个解决方案

你试过把

.Renviron

放在

C:\Users\your user name\

里吗？

你试过把

.Renviron

放在

C:\Users\your user name\

里吗