title: Annotate graph using data from Array
body: <p>I have a matplotlib graph that I have created using data from arrays. I want to annotate this graph at certain points. The x axis is populated with dates (14/06/12, 15/06/12) etc.. The y axis is price (6500, 6624) etc... I would like to annotate at point: for example (x,y) (14/06/12, 6500). This is my code so far:</p>
  
  <pre><code>Date = ["14/06/12", "15/06/12"]
  Open = [6500, 6544]
  High = [5434, 5234]
  Low = [5342, 5325]
  Close = [4523, 2342]
  ohlc = []
  i = 0
  while i &lt; 2:
      Prices = Date[i], Open[i], High[i], low[i], Close[i]
      ohlc.append(Prices)
      i += 1
  
  candlestick_ohlc(ax, ohlc, width=0.8, colorup='g', colordown='r')
  ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d'))
  ax.annotate('Here!', xy=(Date[1], Price[1]))
  plt.show()
  </code></pre>
  
  <p>This is the current graph and I want the annotation on it where i put it:
  <a href="http://imgur.com/a/mv945" rel="nofollow">http://imgur.com/a/mv945</a></p>