update to use np.nan (all lowercase)

Author: kaklise

pecos/graphics.py

@@ -399,7 +399,7 @@ def plot_doy_heatmap(data, cmap='nipy_spectral', vmin=None, vmax=None,
                 data.index.minute + \
                 data.index.second/60 + \
                 data.index.microsecond/(60*1000000.0)
-    piv = pd.pivot_table(data,values=col_name,index=['Y'],columns=['X'],fill_value=np.NaN)
+    piv = pd.pivot_table(data,values=col_name,index=['Y'],columns=['X'],fill_value=np.nan)
 
     # Create the heatmap
     plt.figure(figsize = figsize)

pecos/monitoring.py

@@ -876,7 +876,7 @@ def check_custom_streaming(self, quality_control_func, window, key=None,
                 assert isinstance(metadata[t_timestamp], pd.Series), 'metadata returned by quality_control_func must be of type pd.Series'
 
             np_mask[t] = mask_t.values
-            np_data[~np_mask] = np.NAN
+            np_data[~np_mask] = np.nan
 
             # rebase
             if rebase is not None: