title: barplot using ggplot2
body: <p>I have a data set like this:</p>
  
  <pre><code>cars    trucks  suvs
  1          2    4
  3          5    4
  6          4    6
  4          5    6
  9          12   16
  </code></pre>
  
  <p>I'm trying to draw a bar chart for this data. Currently, I can do it with <code>barplot</code>:</p>
  
  <pre><code>barplot(as.matrix(autos_data), main="Autos", 
           ylab= "Total",beside=TRUE, col=rainbow(5))
  </code></pre>
  
  <p>Generating this graph:</p>
  
  <p><img src="https://i.stack.imgur.com/O3sVs.png" alt="Bar plot"></p>
  
  <p>So my questions are:
  Can I use ggplot2 to draw such a graph? Specifically - how do I use faceting or other options to split the graph by days of the week?
  If yes, how do I accomplish that? 
  Additionally, how do I use facet to produce a different layout?</p>