allow np arrays of scalar quantities to be plotted

1 files changed, 3 insertions, 1 deletions

diff --git a/pint/matplotlib.py b/pint/matplotlib.py
index bda251d..0d28d43 100644
--- a/pint/matplotlib.py
+++ b/pint/matplotlib.py
@@ -31,7 +31,7 @@ class PintConverter(matplotlib.units.ConversionInterface):
 
     def convert(self, value, unit, axis):
         """Convert :`Quantity` instances for matplotlib to use."""
-        if isinstance(value, (tuple, list)):
+        if hasattr(value,"__iter__"):
             return [self._convert_value(v, unit, axis) for v in value]
         else:
             return self._convert_value(value, unit, axis)
@@ -51,6 +51,8 @@ class PintConverter(matplotlib.units.ConversionInterface):
     @staticmethod
     def default_units(x, axis):
         """Get the default unit to use for the given combination of unit and axis."""
+        if hasattr(x,"__iter__") and len(x) > 0:
+            return getattr(x[0], 'units', None)
         return getattr(x, 'units', None)