René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"scatter(..., marker='') raises on drawing with mpl3.3.1","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\n`plt.scatter()` raises upon drawing when called with `marker=''` (no errors with 3.3.0). \r\nThis change of behavior broke seaborn.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nplt.scatter([], [], marker='')  # fails also with plt.scatter([1,2,3], [1,2,3], marker='')\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/backends/backend_macosx.py\", line 61, in _draw\r\n    self.figure.draw(renderer)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py\", line 41, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/figure.py\", line 1863, in draw\r\n    mimage._draw_list_compositing_images(\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/image.py\", line 131, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py\", line 41, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py\", line 411, in wrapper\r\n    return func(*inner_args, **inner_kwargs)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/axes/_base.py\", line 2748, in draw\r\n    mimage._draw_list_compositing_images(renderer, self, artists)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/image.py\", line 131, in _draw_list_compositing_images\r\n    a.draw(renderer)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py\", line 41, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/collections.py\", line 931, in draw\r\n    Collection.draw(self, renderer)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py\", line 41, in draw_wrapper\r\n    return draw(artist, renderer, *args, **kwargs)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/collections.py\", line 385, in draw\r\n    extents = paths[0].get_extents(combined_transform)\r\n  File \"/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/path.py\", line 603, in get_extents\r\n    return Bbox([xys.min(axis=0), xys.max(axis=0)])\r\n  File \"/Users/maoz/miniconda/envs/seaborn_devenv/lib/python3.8/site-packages/numpy/core/_methods.py\", line 43, in _amin\r\n    return umr_minimum(a, axis, None, out, keepdims, initial, where)\r\nValueError: zero-size array to reduction operation minimum which has no identity\r\n```\r\n\r\n**Expected outcome**\r\n\r\nNot to fail.\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: MacOS\r\n  * Matplotlib version: 3.3.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): MacOSX (also reproduces with %inline)\r\n  * Python version: 3.8.3\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: numpy 1.19.1\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":"2020-08-14T12:59:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/18254/matplotlib/issues/18254"}