title: pandas - plot sorted column to increasing integer index
body: <p>Let's say I have a pandas series with numerical values. What's the shortest way to plot the sorted series against an increasing integer index?</p>
  
  <p>The plot should show:</p>
  
  <p>x-axis: 0,1,2,3,4,...</p>
  
  <p>y-axis: the sorted values of the series.</p>
  
  <p>(please notice that I cannot plot it against the series' index, because the index is not necessarily an increasing index. In my case it's some id that I use for different reasons)</p>
  
  <p>Thanks</p>