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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unexpected behavior for Axes.quiver(transform=None)","articleBody":"\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\nI would expect that ``Axes.quiver(transform=None)`` would behave the same as leaving out the kwarg *transform* (None implying default). However this is not the case. Instead the default for a missing transform is `Axes.transData`.\r\n\r\nAs far as I understand, there is no reasonable semantics of an explicit `transform=None` here (except for 'use default'). It's probably an unintended implementation detail.\r\n\r\nI therefore propose to change the behavior of  ``Axes.quiver(transform=None)`` to be the same as leaving out the kwarg. This would allow further code simplification with explicit kwargs (#11145).\r\n\r\n**Code for reproduction**\r\n\r\n~~~\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nX = np.arange(-10, 10, 1)\r\nY = np.arange(-10, 10, 1)\r\nU, V = np.meshgrid(X, Y)\r\n\r\nfig, (ax1, ax2, ax3) = plt.subplots(1, 3, figsize=(12, 3))\r\nax1.quiver(X, Y, U, V)\r\nax2.quiver(X, Y, U, V, transform=None)\r\nax3.quiver(X, Y, U, V, transform=ax2.transData)\r\n\r\nplt.show()\r\n~~~\r\n\r\n![grafik](https://user-images.githubusercontent.com/2836374/39499499-a4702e18-4dae-11e8-97cc-5e84c262e6d2.png)\r\n\r\nExpected: All there Axes should be equal.\r\n","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2018-05-02T00:25:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/11153/matplotlib/issues/11153"}