title: It is possible to create inset graphs?
body: <p>I know that when you use <code>par( fig=c( ... ), new=T )</code>, you can create inset graphs.  However, I was wondering if it is possible to use ggplot2 library to create 'inset' graphs.  </p>
  
  <p>UPDATE 1: I tried using the <code>par()</code> with ggplot2, but it does not work.</p>
  
  <p>UPDATE 2: I found a working solution at <a href="https://groups.google.com/forum/#!topic/ggplot2/XIkND56UUWY" rel="noreferrer">ggplot2 GoogleGroups</a> using <code>grid::viewport()</code>.</p>