MNT: only try to fake numpy's behavior if we have more than 1 input

tacaswell · tacaswell · commit 3ee8a4015f5f · 2019-03-18T22:41:50.000-04:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -6655,7 +6655,7 @@ def hist(self, x, bins=None, range=None, density=None, weights=None,
         # If bins are not specified either explicitly or via range,
         # we need to figure out the range required for all datasets,
         # and supply that to np.histogram.
-        if not bins_array_given and not input_empty:
+        if not bins_array_given and not input_empty and len(x) > 1:
             if weights is not None:
                 _w = np.concatenate(w)
             else:
