title: How to set one candle stick color using mpl_finance?
body: <p>Here is the code:</p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  import datetime
  
  from mpl_finance import candlestick_ochl
  from matplotlib.dates import num2date
  %matplotlib notebook 
  
  # data in a text file, 5 columns: time, opening, close, high, low
  # note that I'm using the time you formated into an ordinal float
  # data = np.loadtxt('finance-data.txt', delimiter=',')
  data = np.array([[1, 2, 3, 4, 1],
          [2, 3, 1, 5, 1],
          [3, 4, 3, 5, 2.3]
          ])
  
  # determine number of days and create a list of those days
  ndays = np.unique(np.trunc(data[:,0]), return_index=True)
  xdays =  []
  for n in np.arange(len(ndays[0])):
      xdays.append(datetime.date.isoformat(num2date(data[ndays[1],0][n])))
  
  # creation of new data by replacing the time array with equally spaced values.
  # this will allow to remove the gap between the days, when plotting the data
  data2 = np.hstack([np.arange(data[:,0].size)[:, np.newaxis], data[:,1:]])
  
  # plot the data
  fig = plt.figure(figsize=(10, 5))
  ax = fig.add_axes([0.1, 0.2, 0.85, 0.7])
      # customization of the axis
  ax.spines['right'].set_color('none')
  ax.spines['top'].set_color('none')
  ax.xaxis.set_ticks_position('bottom')
  ax.yaxis.set_ticks_position('left')
  ax.tick_params(axis='both', direction='out', width=2, length=8,
                 labelsize=12, pad=8)
  ax.spines['left'].set_linewidth(2)
  ax.spines['bottom'].set_linewidth(2)
      # set the ticks of the x axis only when starting a new day
  ax.set_xticks(data2[ndays[1],0])
  ax.set_xticklabels(xdays, rotation=45, horizontalalignment='right')
  
  ax.set_ylabel('Quote ($)', size=20)
  ax.set_ylim([0, 10])
  
  drawData = candlestick_ochl(ax, data2, width=0.5, colorup='g', colordown='r')
  </code></pre>
  
  <p>and here is the output:</p>
  
  <p><a href="https://i.stack.imgur.com/efTGF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/efTGF.png" alt="enter image description here"></a></p>
  
  <p>I would like to change the middle one to orange. How can I find out the tick and change its' color? Thanks. </p>