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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"aspect='equal' ignored when parasitic axis added with twinx/twiny","articleBody":"Consider an axis with equal aspect ratio\r\n\r\n```\r\nfrom matplotlib import pyplot as plt\r\n\r\nfig = plt.figure()\r\nax1 = fig.add_subplot(111, aspect='equal')\r\nax1.grid()\r\nplt.show()\r\n```\r\n![figure_1-5](https://cloud.githubusercontent.com/assets/24677491/21387318/60fa2f44-c777-11e6-9421-140bbecf799d.png)\r\n\r\n---\r\n\r\nAdding a parasitic axis with `twinx()` causes the plot to completely ignore `aspect='equal'`\r\n\r\n```\r\nfrom matplotlib import pyplot as plt\r\n\r\nfig = plt.figure()\r\nax1 = fig.add_subplot(111, aspect='equal')\r\nax1.grid()\r\nax2 = ax1.twinx()\r\nplt.show()\r\n```\r\n\r\n![figure_1-6](https://cloud.githubusercontent.com/assets/24677491/21387344/7a8d06ca-c777-11e6-9339-882f7e9d847b.png)\r\n\r\n---\r\n\r\nCreating the primary axis with the keyword argument `adjustable='box-forced'` causes it to obey `aspect='equal'` but the parasitic axis does not.\r\n\r\n```\r\nfrom matplotlib import pyplot as plt\r\n\r\nfig = plt.figure()\r\nax1 = fig.add_subplot(111, adjustable='box-forced', aspect='equal')\r\nax1.grid()\r\nax2 = ax1.twinx()\r\nplt.show()\r\n```\r\n\r\n![figure_1-7](https://cloud.githubusercontent.com/assets/24677491/21387390/bee23eb2-c777-11e6-9e0f-86e4b07b4bf8.png)\r\n\r\n---\r\n\r\nInterestingly, everything works if the primary axis is created with `host_subplot` (note `adjustable='box-forced'` is still required). However, it seems to be prone to a similar issue to #7648 if `figure.autolayout` is set\r\n\r\n```\r\nimport matplotlib.pyplot as plt\r\nfrom mpl_toolkits.axes_grid1 import host_subplot\r\n\r\nfig = plt.figure()\r\nax1 = host_subplot(111, adjustable='box-forced', aspect='equal')\r\nax1.grid()\r\nax2 = ax1.twinx()\r\nplt.show()\r\n```\r\n![figure_1-8](https://cloud.githubusercontent.com/assets/24677491/21387757/7ddc4faa-c779-11e6-9f80-03edb2c76d7d.png)\r\n\r\n\r\nPlatform: Windows 7\r\nmatplotlib: 1.5.3\r\npython: 2.7.12\r\n","author":{"url":"https://github.com/ndeadly","@type":"Person","name":"ndeadly"},"datePublished":"2016-12-21T11:59:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/7654/matplotlib/issues/7654"}