René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: to_rgba_array(\"none\") returns empty array ","articleBody":"### Bug summary\r\n\r\n`mcolors.to_rgba_array(\"none\")` returns an empty array while `mcolors.to_rgba(\"none\")` and `mcolors.to_rgba_array([\"none\"])` return (0,0,0,0) (which is the documented value of None) and this leads to inconsistencies when trying to use [mcolors.same_color](https://matplotlib.org/devdocs/api/_as_gen/matplotlib.colors.same_color.html#matplotlib.colors.same_color)\r\n\r\n\r\n### Actual outcome\r\n\r\n```pycon\r\n\u003e\u003e\u003e import matplotlib.colors as mcolors\r\n\u003e\u003e\u003e mcolors.to_rgba(\"none\")\r\n(0.0, 0.0, 0.0, 0.0)\r\n\u003e\u003e\u003e mcolors.to_rgba_array(\"none\") \r\narray([], shape=(0, 4), dtype=float64)\r\n\u003e\u003e\u003e mcolors.to_rgba_array([\"none\"])\r\narray([[0., 0., 0., 0.]])\r\n\u003e\u003e\u003e mcolors.same_color(\"none\", mcolors.to_rgba(\"none\"))\r\nFalse\r\n\u003e\u003e\u003e mcolors.same_color([\"none\"], mcolors.to_rgba(\"none\")) \r\nTrue\r\n```\r\n\r\n\r\n\r\n### Expected outcome\r\n\r\n```pycon\r\n\u003e\u003e\u003e import matplotlib.colors as mcolors\r\n\u003e\u003e\u003e mcolors.to_rgba(\"none\")\r\n(0.0, 0.0, 0.0, 0.0)\r\n\u003e\u003e\u003e mcolors.to_rgba_array(\"none\") \r\narray([[0., 0., 0., 0.]])\r\n\u003e\u003e\u003e mcolors.to_rgba_array([\"none\"])\r\narray([[0., 0., 0., 0.]])\r\n\u003e\u003e\u003e mcolors.same_color(\"none\", mcolors.to_rgba(\"none\"))\r\nTrue\r\n\u003e\u003e\u003e mcolors.same_color([\"none\"], mcolors.to_rgba(\"none\")) \r\nTrue\r\n```\r\n\r\n### Additional information\r\n\r\nI tried the quick fixes of changing the return here to `array([[0., 0., 0., 0.]])` and `np.array([to_rgba('none')], float)`\r\n\r\nhttps://github.com/matplotlib/matplotlib/blob/d347c3227f8de8a99aa327390fee619310452a96/lib/matplotlib/colors.py#L482-L483\r\n\r\nThat yielded a ton of test failures, mostly around colorbars/contours, hatches,  and  but roughly the diffs all looked something like this:\r\n\r\ncontourf_extend_patches (actual, expected)\r\n![image](https://github.com/matplotlib/matplotlib/assets/1300499/865eaa8a-2293-4b73-bf21-e8b9f95e3831)\r\n\r\ncolorbar_two_slope\r\n![image](https://github.com/matplotlib/matplotlib/assets/1300499/cbce73cd-e4f5-4caf-9e17-b8881dc01a96)\r\n\r\nAlso I realize this could be not worth fixing and a quick fix is to cast `none` to a list in `same_color`\r\n","author":{"url":"https://github.com/story645","@type":"Person","name":"story645"},"datePublished":"2024-06-27T00:01:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/28475/matplotlib/issues/28475"}