René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Axe3D text() method does not allow zdir=numpy.array(...)","articleBody":"### Bug summary\n\n`axes.text(..., zdir=zdir)` fails with `ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()` when zdir is a numpy array. The error occurs here: https://github.com/matplotlib/matplotlib/blob/b70e3246b10d8cf01b87fee358db32c8786aa0b0/lib/mpl_toolkits/mplot3d/art3d.py#L61\n\n### Code for reproduction\n\n```Python\nimport numpy as np\nimport matplotlib.pyplot as plt\nimport mpl_toolkits.mplot3d  # noqa: F401\n\naxes = plt.axes([0.0, 0.2, 1.0, 0.8], projection='3d')\naxes.text(0, 0, 0, \"zdir=[1,0,0]\", zdir=np.array([1, 0, 0]))\naxes.set_xlabel(\"x axis\")\nplt.show()\n```\n\n### Actual outcome\n\n```python\nTraceback (most recent call last):\n  File \".../text3d_error.py\", line 6, in \u003cmodule\u003e\n    axes.text(0, 0, 0, \"zdir=[1,0,0]\", zdir=np.array([1, 0, 0]))\n    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \".../python3.13/site-packages/mpl_toolkits/mplot3d/axes3d.py\", line 1944, in text\n    art3d.text_2d_to_3d(text, z, zdir, axlim_clip)\n    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \".../python3.13/site-packages/mpl_toolkits/mplot3d/art3d.py\", line 222, in text_2d_to_3d\n    obj.set_3d_properties(z, zdir, axlim_clip)\n    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^\n  File \".../site-packages/mpl_toolkits/mplot3d/art3d.py\", line 178, in set_3d_properties\n    self._dir_vec = get_dir_vector(zdir)\n                    ~~~~~~~~~~~~~~^^^^^^\n  File \".../site-packages/mpl_toolkits/mplot3d/art3d.py\", line 62, in get_dir_vector\n    if zdir == 'x':\n       ^^^^^^^^^^^\nValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()\n```\n\n### Expected outcome\n\nA 3D box with a label oriented along the x direction.\n\n### Additional information\n\nReplacing the numpy array with a list produces the expected output since `[1, 0, 0] == 'x'` evaluates to `False`.\n\nThe relevant code in main as of 2025-12-16 (post v3.10.8) will still fail.\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.10.3\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/pkienzle","@type":"Person","name":"pkienzle"},"datePublished":"2025-12-16T17:14:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/30868/matplotlib/issues/30868"}