René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: quiver 3d does not support \"mid\" as an alias for \"middle\", but quiver 2d does","articleBody":"### Documentation Link\n\nhttps://matplotlib.org/devdocs/api/_as_gen/matplotlib.quiver.Quiver.html#matplotlib.quiver.Quiver\n\n### Problem\n\nThe documentation states that \"mid\" can be used as a synonym for \"middle\" however this is not implemented in the code: \n\n```\nTraceback (most recent call last):\n  File \"c:\\Users\\mean\\OneDrive - COWI\\Documents\\04_code\\triaxial_concrete_complementary_energy\\example.py\", line 147, in \u003cmodule\u003e\n    plot_stress_axes(mat, ax, ttl)\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^\n  File \"c:\\Users\\mean\\OneDrive - COWI\\Documents\\04_code\\triaxial_concrete_complementary_energy\\example.py\", line 120, in plot_stress_axes\n    ax.quiver(\n    ~~~~~~~~~^\n        0,\n        ^^\n    ...\u003c8 lines\u003e...\n        pivot=\"mid\",\n        ^^^^^^^^^^^^\n    )\n    ^\n  File \"C:\\code\\python_venvs\\triax_concrete\\Lib\\site-packages\\matplotlib\\__init__.py\", line 1524, in inner\n    return func(\n        ax,\n        *map(cbook.sanitize_sequence, args),\n        **{k: cbook.sanitize_sequence(v) for k, v in kwargs.items()})\n  File \"C:\\code\\python_venvs\\triax_concrete\\Lib\\site-packages\\mpl_toolkits\\mplot3d\\axes3d.py\", line 3298, in quiver\n    _api.check_in_list(['tail', 'middle', 'tip'], pivot=pivot)\n    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\code\\python_venvs\\triax_concrete\\Lib\\site-packages\\matplotlib\\_api\\__init__.py\", line 144, in check_in_list\n    raise ValueError(msg)\nValueError: 'mid' is not a valid value for pivot; supported values are 'tail', 'middle', 'tip'\n```\n\n### Suggested improvement\n\nRemove \"mid\" as an option in the docs\n\nBefore:\n```python\npivot : {'tail', 'mid', 'middle', 'tip'}, default: 'tail'\n    The part of the arrow that is anchored to the *X*, *Y* grid. The arrow\n    rotates about this point.\n\n    'mid' is a synonym for 'middle'.\n```\n\n```python\npivot : {'tail', 'middle', 'tip'}, default: 'tail'\n    The part of the arrow that is anchored to the *X*, *Y* grid. The arrow\n    rotates about this point.\n```","author":{"url":"https://github.com/MEMAndersen","@type":"Person","name":"MEMAndersen"},"datePublished":"2026-02-10T08:06:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/31127/matplotlib/issues/31127"}