无法在最新版本的RStudio和R Version.3.1.1中安装软件包

我无法通过RStudio and R Version.3.1.1.Kindly帮助的最新版本安装软件包.我得到了如下所述的错误:

Example:
Warning in install.packages :
  InternetOpenUrl failed: ''
Warning in install.packages :
  InternetOpenUrl failed: ''
Warning in install.packages :
  unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.1
Installing package into ‘C:/Users/Documents/R/win-library/3.1’
(as ‘lib’ is unspecified)
Warning in install.packages :
  InternetOpenUrl failed: ''
Warning in install.packages :
  InternetOpenUrl failed: ''
Warning in install.packages :
  unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.1
Warning in install.packages :
  package ‘reshape’ is not available (for R version 3.1.1)

cer.. 135

不是100%肯定你有同样的问题,但我发现我的工作阻止提供的每个镜像站点选项的困难方式,我得到这样的错误:

Installing package into ‘/usr/lib64/R/library’
(as ‘lib’ is unspecified)
--- Please select a CRAN mirror for use in this session ---
Error in download.file(url, destfile = f, quiet = TRUE) : 
  unsupported URL scheme
Warning: unable to access index for repository https://rweb.crmda.ku.edu/cran/src/contrib
Warning message:
package ‘ggplot2’ is not available (for R version 3.2.2)

解决方法(我正在使用CentOS)...

install.packages('package_name', dependencies=TRUE, repos='http://cran.rstudio.com/')

我希望这能节省数小时的挫折感.