René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Setting the edgecolor when using `ax.hist` raises `Invalid RGBA argument` in \u003e=3.10","articleBody":"### Bug summary\n\nAn error is raised when using the `edgecolor` argument with `ax.hist`.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nimport numpy as np\n\nx = np.random.normal(10000)\n\nfig, ax = plt.subplots()\nax.hist(\n    x,\n    edgecolor=(0.5, 0, 0.5, 0.8),\n    facecolor=\"None\",\n)\n```\n\n### Actual outcome\n\n```\nTraceback (most recent call last):\n  File \"/home/nvaytet/code/mpltoolbox/jupyter/example.py\", line 7, in \u003cmodule\u003e\n    ax.hist(\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/_api/deprecation.py\", line 453, in wrapper\n    return func(*args, **kwargs)\n           ^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/__init__.py\", line 1521, in inner\n    return func(\n           ^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/axes/_axes.py\", line 7266, in hist\n    p._internal_update(kwargs)\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/artist.py\", line 1233, in _internal_update\n    return self._update_props(\n           ^^^^^^^^^^^^^^^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/artist.py\", line 1209, in _update_props\n    ret.append(func(v))\n               ^^^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/patches.py\", line 386, in set_edgecolor\n    self._set_edgecolor(color)\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/patches.py\", line 372, in _set_edgecolor\n    self._edgecolor = colors.to_rgba(color, self._alpha)\n                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/colors.py\", line 316, in to_rgba\n    rgba = _to_rgba_no_colorcycle(c, alpha)\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/nvaytet/miniforge3/lib/python3.12/site-packages/matplotlib/colors.py\", line 400, in _to_rgba_no_colorcycle\n    raise ValueError(f\"Invalid RGBA argument: {orig_c!r}\")\nValueError: Invalid RGBA argument: np.float64(0.5)\n```\n\n### Expected outcome\n\nShould not raise.\n\n### Additional information\n\nThis raises with matplotlib 3.10.0 \u0026 3.10.1.\nNo error is raised with 3.9.4.\n\n### Operating system\n\nUbuntu 24.04\n\n### Matplotlib Version\n\n3.10.*\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.12\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nconda","author":{"url":"https://github.com/nvaytet","@type":"Person","name":"nvaytet"},"datePublished":"2025-04-28T22:27:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/29985/matplotlib/issues/29985"}