Fix bar with one value in it (#6301)

holoviz · Jul 4, 2024 · 2bcd663 · 2bcd663
1 parent eb79ab5
commit 2bcd663
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/holoviews/plotting/bokeh/chart.py b/holoviews/plotting/bokeh/chart.py
@@ -922,7 +922,8 @@ def get_data(self, element, ranges, style):
             is_dt = isdatetime(xvals)
             if is_dt or xvals.dtype.kind not in 'OU':
                 xdiff = np.abs(np.diff(xvals))
-                if len(np.unique(xdiff)) == 1 and xdiff[0] == 0:
+                diff_size = len(np.unique(xdiff))
+                if diff_size == 0 or (diff_size == 1 and xdiff[0] == 0):
                     xdiff = 1
                 if is_dt:
                     width *= xdiff.astype('timedelta64[ms]').astype(np.int64)

diff --git a/holoviews/tests/plotting/bokeh/test_barplot.py b/holoviews/tests/plotting/bokeh/test_barplot.py
@@ -37,6 +37,14 @@ def test_empty_bars(self):
         for v in source.data.values():
             self.assertEqual(len(v), 0)
 
+    def test_bars_single_value(self):
+        df = pd.DataFrame({"time": [1], "value": [-1]})
+        bars = Bars(df)
+        plot = bokeh_renderer.get_plot(bars)
+        source = plot.handles['source']
+        assert source.data['time'], np.array([1])
+        assert source.data['value'], np.array([-1])
+
     def test_bars_grouped_categories(self):
         bars = Bars([('A', 0, 1), ('A', 1, -1), ('B', 0, 2)],
                     kdims=['Index', 'Category'], vdims=['Value'])