title: in R, how to install ggbiplot?
body: <p>I am running R version 3.2.3 in RStudio. I tried following these instructions:</p>
  
  <pre><code>library(devtools)
  install_github("ggbiplot", "vqv")
  </code></pre>
  
  <p>and</p>
  
  <pre><code>library(devtools)
  install_github("vqv/ggbiplot")
  </code></pre>
  
  <p>from here <a href="http://www.vince.vu/software/" rel="nofollow noreferrer">http://www.vince.vu/software/</a></p>
  
  <p>but I am getting this error:</p>
  
  <pre><code>&gt; library(devtools)
  &gt; install_github("vqv/ggbiplot")
  Downloading GitHub repo vqv/ggbiplot@master
  from URL https://api.github.com/repos/vqv/ggbiplot/zipball/master
  Installing ggbiplot
  Installing 1 package: ggplot2
  Warning: package ‘ggplot2’ is in use and will not be installed
  "C:/PROGRA~1/R/R-32~1.3/bin/x64/R" --no-site-file --no-environ --no-save --no-restore CMD INSTALL  \
    "C:/Users/ms/AppData/Local/Temp/RtmpSIMFOv/devtools216870196a49/vqv-ggbiplot-7325e88"  \
    --library="\\ymr.corp.rt.org/homedrive$/MS/R/win-library/3.2" --install-tests 
  
  * installing *source* package 'ggbiplot' ...
  ** R
  ** data
  ** preparing package for lazy loading
  ** help
  *** installing help indices
  ** building package indices
  ** testing if installed package can be loaded
  *** arch - i386
  Warning in library(pkg_name, lib.loc = lib, character.only = TRUE, logical.return = TRUE) :
    there is no package called 'ggbiplot'
  Error: loading failed
  Execution halted
  *** arch - x64
  Warning in library(pkg_name, lib.loc = lib, character.only = TRUE, logical.return = TRUE) :
    there is no package called 'ggbiplot'
  Error: loading failed
  Execution halted
  ERROR: loading failed for 'i386', 'x64'
  * removing '\\ymr.corp.rt.org/homedrive$/MS/R/win-library/3.2/ggbiplot'
  Error: Command failed (1)
  </code></pre>
  
  <p>I have searched for answers and tried (unsuccessfully) to follow suggestions here <a href="https://stackoverflow.com/questions/17366772/instal-r-packages-from-github-downloading-master-zip">Instal R packages from github downloading master.zip</a> and here <a href="https://stackoverflow.com/questions/29918714/how-can-i-offline-install-ggbiplot-using-windows">how can I offline install ggbiplot using windows</a></p>