ensure interpolation for plot_hpd always works (#1039)

* ensure interpolation for plot_hpd always works * update changelog
arviz-devs · Feb 4, 2020 · 034dd14 · 034dd14
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -19,6 +19,7 @@
 * Violinplot: fix histogram (#997)
 * Convert all instances of SyntaxWarning to UserWarning (#1016)
 * Fix `point_estimate` in `plot_posterior` (#1038)
+* Fix interpolation `hpd_plot` (#1039)
 
 ### Deprecation
 

diff --git a/arviz/plots/hpdplot.py b/arviz/plots/hpdplot.py
@@ -102,7 +102,8 @@ def plot_hpd(
             smooth_kwargs = {}
         smooth_kwargs.setdefault("window_length", 55)
         smooth_kwargs.setdefault("polyorder", 2)
-        x_data = np.linspace(x.min(), x.max(), 200)
+        eps = np.finfo(float).eps
+        x_data = np.linspace(x.min() + eps, x.max() - eps, 200)
         hpd_interp = griddata(x, hpd_, x_data)
         y_data = savgol_filter(hpd_interp, axis=0, **smooth_kwargs)
     else: