title: Seaborn kdeplot not plotting some data?
body: <p>I'm trying to get the <a href="https://stanford.edu/~mwaskom/software/seaborn/generated/seaborn.kdeplot.html" rel="nofollow">Seaborn kdeplot</a> example to work on my dataset. For some reason, one of my datasets isn't plotting at all, but the other seems to be plotting fine. To get a minimal working example, I have sampled only 10 rows from my very large data sets.</p>
  
  <p>My input data looks like this:</p>
  
  <pre><code>#Dataframe dfA
      index   x       y     category
  0   595700  5   1.000000    14.0
  1   293559  4   1.000000    14.0
  2   562295  3   0.000000    14.0
  3   219426  4   1.000000    14.0
  4   592731  2   1.000000    14.0
  5   178573  3   1.000000    14.0
  6   553156  4   0.500000    14.0
  7   385031  1   1.000000    14.0
  8   391681  3   0.999998    14.0
  9   492771  2   1.000000    14.0
  
  # Dataframe dfB
      index   x      y      category
  0   56345   3   1.000000    6.0
  1   383741  4   1.000000    6.0
  2   103044  2   1.000000    6.0
  3   297357  5   1.000000    6.0
  4   257508  3   1.000000    6.0
  5   223600  2   0.999938    6.0
  6   44530   2   1.000000    6.0
  7   82925   3   1.000000    6.0
  8   169592  3   0.500000    6.0
  9   229482  4   0.285714    6.0
  </code></pre>
  
  <p>My code snippet looks like this:</p>
  
  <pre><code>import seaborn as sns
  import matplotlib.pyplot as plt
  
  sns.set(style="darkgrid")
  
  # Set up the figure
  f, ax = plt.subplots(figsize=(8, 8))
  
  # Draw the two density plots
  ax = sns.kdeplot(dfA.x, dfA.y,
               cmap="Reds", shade=True, shade_lowest=False)
  ax = sns.kdeplot(dfB.x, dfB.y,
               cmap="Blues", shade=True, shade_lowest=False)
  </code></pre>
  
  <p>Why isn't the data from dataframe <code>dfA</code> actually plotting?</p>