title: Lines not showing up on Matplotlib graph
body: <p>I am trying to plot three lines on the same plot in Matplotlib. They are InvoicesThisYear, DisputesThisYear, and PercentThisYear (Which is Disputes/Invoices)</p>
  
  <p>The original input is two columns of dates -- one for the date of a logged dispute and one for the date of a logged invoice. </p>
  
  <p>I use the dates to count up the number of disputes and invoices per month during a certain year. </p>
  
  <p>Then I try to graph it, but it comes up empty. I started with just trying to print PercentThisYear and InvoicesThisYear. </p>
  
  <pre><code>PercentThisYear = (DisputesFYThisYear/InvoicesFYThisYear).fillna(0.0)
  
  #Percent_ThisYear.plot(kind = 'line')
  #InvoicesFYThisYear.plot(kind = 'line')
  plt.plot(PercentThisYear)
  
  
  plt.xlabel('Date')
  plt.ylabel('Percent')
  plt.title('Customer Disputes')
  
  # Remove the plot frame lines. They are unnecessary chartjunk.    
  ax = plt.subplot(111)    
  ax.spines["top"].set_visible(False)    
  ax.spines["bottom"].set_visible(False)    
  ax.spines["right"].set_visible(False)    
  ax.spines["left"].set_visible(False) 
  ax2 = ax.twinx()
  ax2.plot(InvoicesFYThisYear)
  
  # Ensure that the axis ticks only show up on the bottom and left of the plot.    
  # Ticks on the right and top of the plot are generally unnecessary chartjunk.    
  ax.get_xaxis().tick_bottom()    
  #ax.get_yaxis().tick_left()    
  
  # Limit the range of the plot to only where the data is.    
  # Avoid unnecessary whitespace.   
  datenow = datetime.datetime.now()
  dstart = datetime.datetime(2015,4,1)
  print datenow 
  #plt.ylim(0, .14)    
  plt.xlim(dstart, datenow)
  
  firsts=[]
  for i in range(dstart.month, datenow.month+1):
      firsts.append(datetime.datetime(2015,i,1))
  plt.xticks(firsts)
  
  plt.show()
  </code></pre>
  
  <p>This is the output... The date is all messed up and nothing prints. But the scaled on the axes look right. What am I doing wrong?</p>
  
  <p><a href="https://i.stack.imgur.com/NkjHv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NkjHv.png" alt="enter image description here"></a></p>
  
  <p>Here is the set up leading up to the graph if that is helpful</p>
  
  <p>The Input looks like this:</p>
  
  <pre><code>InvoicesThisYear
  Out[82]: 
  7    7529
  5    5511
  6    4934
  8    3552
  dtype: int64
  
  
  DisputesThisYear
  Out[83]: 
  2    211
  1    98
  7     54
  4     43
  3     32
  6     29
  5     21
  8     8
  dtype: int64
  
  PercentThisYear
  Out[84]: 
  1    0.000000
  2    0.000000
  3    0.000000
  4    0.000000
  5    0.003810
  6    0.005877
  7    0.007172
  8    0.002252
  dtype: float64
  </code></pre>