René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Resetting aspect to auto does not work for axes with twinx","articleBody":"### Bug summary\n\nThis bug occurs when I create a subplot with twin axes. Setting the `aspect` of axes from `'auto'` to `'equal'` works fine, but resetting the `aspect` back to `'auto'` does not work.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\n\nfig = plt.figure()\nax = fig.add_subplot()\nax_twin = ax.twinx() # No bug if I remove this\nax.plot([0, 1, 2], [0, 2, 1])\n\nax.set_aspect('auto')\nplt.savefig('plot1.png')\nax.set_aspect('equal')\nplt.savefig('tmp.png') # No bug if I remove this\nax.set_aspect('auto')\nplt.savefig('plot2.png') # plot2.png should be the same as plot1.png\n```\n\n### Actual outcome\n\n#### plot1.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/beb8203c-70dc-4a5a-b2b5-4e87fbeea73c\" /\u003e\n\n#### plot2.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/c727f1b3-afcb-48e2-a186-fe00aa1e87b3\" /\u003e\n\n### Expected outcome\n\nplot2.png should be the same as plot1.png\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.10.8\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/williamlus","@type":"Person","name":"williamlus"},"datePublished":"2026-03-04T11:05:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/31232/matplotlib/issues/31232"}