René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Scatter produce multiple colors for a single RGB/RGBA input","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nScatter [docs](https://matplotlib.org/3.2.1/api/_as_gen/matplotlib.axes.Axes.scatter.html?highlight=scatter#matplotlib.axes.Axes.scatter) say that in order to provide a single RGB/RGBA color for all scatter elements, it is required to pass a 2D array with a single row for `c` argument input:\r\n\r\n\u003e If you want to specify the same RGB or RGBA value for all points, use a 2-D array with a single row. Otherwise, value- matching will have precedence in case of a size matching with x and y.\r\n\r\nWhen x/y shape is 3 and RGB is passed as a 2D array with a single row (e.g. `c=[[1, 0.5, 0.05]]`), or when x/y shape is 4 and RGBA is passed as a 2D array with a single row, the plot elements have several different colors (taken from the default colormap?) while all should have the same color. The problem occurs for both `plt.scatter` and `ax.scatter` calls, and also if `c` input is provided as a numpy array of shape (1,3) for RGB or (1,4) for RGBA instead of a nested list. \r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nplt.scatter(range(3), range(3), c=[[1, 0.5, 0.05]])\r\n#alternatively, for RGBA scenario\r\nplt.scatter(range(4), range(4), c=[[1, 0.5, 0.05, 1]])\r\n```\r\n\r\n**Actual outcome**\r\n![840-mpl](https://user-images.githubusercontent.com/13831112/82084053-5d043e80-96f3-11ea-9d01-5b8afa216e0a.png)\r\n\r\n**Expected outcome**\r\nAll points have the same color: RGB (1, 0.5, 0.05).\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Linux\r\n  * Matplotlib version: 3.2.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): agg\r\n  * Python version: 3.7.3\r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\nMatplotlib installed through pip\r\n","author":{"url":"https://github.com/MaozGelbart","@type":"Person","name":"MaozGelbart"},"datePublished":"2020-05-15T19:18:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/17423/matplotlib/issues/17423"}