title: ValueError: The condensed distance matrix must contain only finite values
body: <p>I am trying to cluster and keep getting &quot;ValueError: The condensed distance matrix must contain only finite values.&quot;</p>
  <p>I have tried the code below and cannot fix the issue.</p>
  <pre><code>df.fillna(0)
  df.replace(np.nan, 0)
  </code></pre>
  <pre><code>plt.figure(figsize=(10,3))
  %matplotlib inline
  plt.style.use('seaborn-whitegrid')
  columns = ['hr_starting','coal','gas','hydro','nuclear','oil','other','solar','storage','wind','flywheel','total_gen','thermal_load','total_renewables','gas_percentage_of_thermal_load','philadelphia','congestion_price','energy_price','lmp_price','marginal_loss_price']
  x = df[['coal','gas','hydro','nuclear','oil','other','solar','storage','wind','total_gen','thermal_load','total_renewables','congestion_price','energy_price','lmp_price','marginal_loss_price']]
  
  y = df['total_gen']
  
  linked = linkage(x, 'single')
  
  labelList = range(1, 11)
  
  plt.figure(figsize=(10, 7))
  dendrogram(linked,
              orientation='top',
              labels=labelList,
              distance_sort='descending',
              show_leaf_counts=True)
  
  plt.xlabel('cluster size')
  plt.ylabel('distance')
  plt.show()```
  </code></pre>