FIX: make robust to units

jklymak · jklymak · commit aa6dfaa6c24b · 2019-01-12T14:25:55.000-08:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -2038,7 +2038,8 @@ def _convert_dx(dx, x0, xconv, convert):
             # vector.  This is particularly an issue if
             # x0 and dx are lists so x0 + dx just concatenates the lists.
             # We can't just cast x0 and dx to numpy arrays because that
-            # removes the units from unit packages like `pint`.
+            # removes the units from unit packages like `pint` that
+            # wrap numpy arrays.
             try:
                 x0 = x0[0]
             except (TypeError, IndexError, KeyError):
