title: Replace chart in facet with Matplotlib
body: <p>I am working with Matplotlib. I am trying to make a facet with four charts. Below you can see my code:</p>
  <pre><code>import pandas as pd
  import matplotlib.pyplot as plt
  from matplotlib.cm import get_cmap
  
  # Poligon for plot
  fig, axs = plt.subplots(2,2, figsize=(17,10))
  #plt.subplots_adjust(wspace=0.2, hspace=0.6)
  plt.subplots_adjust(wspace=0.2, hspace=0.3)
  
  
  df.plot(x='year', kind='bar', stacked=True,title='Title 1',ax=axs[0,0],legend=True)
  df.plot(x='year', kind='bar', stacked=True,title='Title 2',ax=axs[0,1],legend=None)  
  df.plot(x='year', kind='bar', stacked=True,title='Title 3',ax=axs[1,0],legend=True)
  df.plot(x='year', kind='bar', stacked=True,title='Title 4',ax=axs[1,1],legend=None) #&lt;-This chart is need to be replaced
  
  plt.suptitle(t='Description of...', fontsize=16)
  </code></pre>
  <p><a href="https://i.stack.imgur.com/y1KpW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/y1KpW.png" alt="enter image description here" /></a></p>
  <p>Now the last figure I want to change with other combo line charts. The code is shown below</p>
  <pre><code>fig, ax_1 = plt.subplots(figsize = (8, 5))
  ax_2 = ax_1.twinx()
  cmap = get_cmap('tab10')
  
  ax_1.bar(df['year'], df['open'], label = 'open', color = cmap(0))
  ax_2.plot(df['year'], df['closed'], label = 'closed', color = cmap(0.1),linewidth = '4.5')
  
  handles_1, labels_1 = ax_1.get_legend_handles_labels()
  handles_2, labels_2 = ax_2.get_legend_handles_labels()
  
  ax_1.legend(handles = handles_1 + handles_2, labels = labels_1 + labels_2, loc = 'upper left', shadow = True)
  ax_1.grid(axis = 'y')
  ax_1.set_title('Sales comparison')
  plt.show()
  </code></pre>
  <p><a href="https://i.stack.imgur.com/la0CT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/la0CT.png" alt="enter image description here" /></a></p>
  <p>Now I want to replace the last bar chart from the facet with a combo line chart from the code below. I tried to put <code>axs[1,1]</code> in the code above but is not working. So can anybody help me how to solve this problem and replace the chart?</p>