title: Using numbers as matplotlib plot markers
body: <p>I have a 1-D numpy array, which I want to plot and I wanted the plot marker to be a number which shows the location of the element. For example, if my array is <code>[2.5,4,3]</code> then I want the plot to have the number 0 at the point (0,2.5), 1 at (1,4) and 2 at (2,3) and so on.</p>
  
  <p>How to do this?</p>