title: How to download packages, Programming R
body: <p>I have no idea how to open the file of the packages on programming R. For instance, when I download one of the Windows binaries of rgl from <a href="http://cran.r-project.org/web/packages/rgl/index.htm" rel="nofollow">http://cran.r-project.org/web/packages/rgl/index.htm</a> and I select R file of the downloaded zip file,using programming R,  it does not work. How can I fix this problem?  </p>