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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"axhline/axvline broken with pint.Quantity","articleBody":"With matplotlib 2.0.2, you can't use pint.Quantity with `axhline` or `axvline`:\r\n```python\r\n%matplotlib inline\r\n\r\nimport matplotlib.pyplot as plt\r\nimport pint\r\n\r\nunits = pint.UnitRegistry()\r\nfig, axes = plt.subplots(1, 1)\r\naxes.axhline(0 * units.meter)\r\n```\r\nyields:\r\n```pytb\r\n\r\n---------------------------------------------------------------------------\r\nValueError                                Traceback (most recent call last)\r\n\u003cipython-input-3-b77d6298b805\u003e in \u003cmodule\u003e()\r\n      6 units = pint.UnitRegistry()\r\n      7 fig, axes = plt.subplots(1, 1)\r\n----\u003e 8 axes.axhline(0 * units.meter)\r\n\r\n~/miniconda3/envs/py36/lib/python3.6/site-packages/matplotlib/axes/_axes.py in axhline(self, y, xmin, xmax, **kwargs)\r\n    720         self._process_unit_info(ydata=y, kwargs=kwargs)\r\n    721         yy = self.convert_yunits(y)\r\n--\u003e 722         scaley = (yy \u003c ymin) or (yy \u003e ymax)\r\n    723 \r\n    724         trans = self.get_yaxis_transform(which='grid')\r\n\r\n~/miniconda3/envs/py36/lib/python3.6/site-packages/pint/quantity.py in \u003clambda\u003e(self, other)\r\n   1075                   other.to_root_units().magnitude)\r\n   1076 \r\n-\u003e 1077     __lt__ = lambda self, other: self.compare(other, op=operator.lt)\r\n   1078     __le__ = lambda self, other: self.compare(other, op=operator.le)\r\n   1079     __ge__ = lambda self, other: self.compare(other, op=operator.ge)\r\n\r\n~/miniconda3/envs/py36/lib/python3.6/site-packages/pint/quantity.py in compare(self, other, op)\r\n   1065                 return op(self._convert_magnitude_not_inplace(UnitsContainer()), other)\r\n   1066             else:\r\n-\u003e 1067                 raise ValueError('Cannot compare Quantity and {0}'.format(type(other)))\r\n   1068 \r\n   1069         if self._units == other._units:\r\n\r\nValueError: Cannot compare Quantity and \u003cclass 'numpy.float64'\u003e\r\n```","author":{"url":"https://github.com/dopplershift","@type":"Person","name":"dopplershift"},"datePublished":"2017-07-18T22:25:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/8910/matplotlib/issues/8910"}