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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Weird behavior with pint.Quantity + masked array","articleBody":"From my SciPy 2017 talk, the combination of pint.Quantity for unit support with masked arrays produces problems not seen with either individually:\r\n\r\n```python\r\n%matplotlib inline\r\n\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\nimport pint\r\n\r\nunits = pint.UnitRegistry()\r\n\r\ndata = np.random.randn(30,)\r\ndata_units = data * units.meters\r\ndata_masked = np.ma.array(data, mask=data\u003c0.)\r\ndata_masked_units = data_masked * units.meters\r\n\r\nfig, axes = plt.subplots(1, 3, sharex=True, sharey=True, figsize=(8, 4))\r\naxes[0].plot(data_units)\r\naxes[1].plot(data_masked)\r\naxes[2].plot(data_masked_units)\r\n```\r\n\r\nproduces:\r\n\r\n![bug](https://user-images.githubusercontent.com/221526/28341716-140498fa-6bd2-11e7-9f24-bda2f07a4d94.png)\r\n","author":{"url":"https://github.com/dopplershift","@type":"Person","name":"dopplershift"},"datePublished":"2017-07-18T21:59:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/8908/matplotlib/issues/8908"}