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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Unexpected behavior of the line style specifiers in the histogram method","articleBody":"### Bug summary\n\nThere is a strange change on the behavior of the line style specifiers of the `hist` method in `matplotlib` when moving from version 3.9.0 to 3.10.1. It seems like the `linestyle` and `ls` arguments are behaving differently. In addition, it is no longer possible to specify a customized line style for histograms via a tuple `ls=(0, (1, 10))`. This is not the case for the `plot` method.\n\nIn `matplotlib` 3.9.0:\n\n![Image](https://github.com/user-attachments/assets/255892c3-b5c4-4148-8c96-de8912dde280)\n\nIn `matplotlib` 3.10.1:\n\n![Image](https://github.com/user-attachments/assets/fb8c355b-8941-4027-ad32-df1c26113a38)\n\nUsing the `linestyle` argument with `(0, (1, 10))` as a value leads to the following error\n\n```\nValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.\n```\n\nNote that when using `ls` there is no error, but the result is not what we would expect.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nimport numpy as np\n\nx = np.random.normal(0, 1, 10_000)\n\nfig, ((ax0, ax1), (ax2, ax3)) = plt.subplots(2, 2, figsize=(8, 8))\nax0.plot(x, x, ls=(0, (1, 10)), lw=2)\nax0.set_title(\"scatter plot (ls)\")\nax1.plot(x, x, linestyle=(0, (1, 10)), lw=2)\nax1.set_title(\"scatter plot (linestyle)\")\n# this does not display any error, but the histogram is incorrect\nax2.hist(x, bins=10, range=(-5, +5), ls=(0, (1, 10)), histtype=\"step\", lw=2)\nax2.set_title(\"hist (ls)\")\n# this gives an error in 3.10.1\nax3.hist(x, bins=10, range=(-5, +5), linestyle=(0, (1, 10)), histtype=\"step\", lw=2)\nax3.set_title(\"hist (linestyle)\")\nplt.show()\n```\n\n### Actual outcome\n\nValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.\n\n### Expected outcome\n\n![Image](https://github.com/user-attachments/assets/4a3a058b-a37b-468e-93ff-8ba502eb7018)\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.10.1\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/mramospe","@type":"Person","name":"mramospe"},"datePublished":"2025-04-02T10:04:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/29857/matplotlib/issues/29857"}