title: How do I keep the original order in ggplot2
body: <p>I have the following code:</p>
  
  <pre><code>df &lt;- data.frame(Days = days,Temperature = temp)
  pl &lt;- ggplot(df,aes(x=Days,y=Temperature)) + geom_point()
  print(pl)
  </code></pre>
  
  <p>When I try running this code it shows the days in alphabetical order instead of the index order (Mon,Tue,Wed,Thu,Fri). How can I change it to the correct order?</p>