title: Bar graph starting from zero
body: <p>I have a vector with 11 elements. I want to display the graph as in this picture:
  <img src="https://s21.postimg.org/jm8d0426v/asdas.png" alt="image"></p>
  
  <p>but my graph starts from first month. How can I make it start from the zeroth month? </p>