René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: ax.errorbar raises for all-nan data on matplotlib 3.6.2","articleBody":"### Bug summary\r\n\r\nThe function `ax.errorbar` raises a `StopIteration` error when `yerr` contains only `NaN` values.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\nfig, ax = plt.subplots(1, 1)\r\nax.errorbar([0], [0], [np.nan])\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n```shell\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/__init__.py\", line 1423, in inner\r\n    return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n  File \"~.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/axes/_axes.py\", line 3488, in errorbar\r\n    yerr = _upcast_err(yerr)\r\n  File \"~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/axes/_axes.py\", line 3470, in _upcast_err\r\n    isinstance(cbook._safe_first_finite(err), np.ndarray)\r\n  File \"~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/cbook/__init__.py\", line 1749, in _safe_first_finite\r\n    return next(val for val in obj if safe_isfinite(val))\r\nStopIteration\r\n```\r\n\r\n### Expected outcome\r\n\r\nNo crash, similar to the case where only some values are NaN.\r\n\r\n### Additional information\r\n\r\nThis happens because  `_upcast_err` unconditionally looks for a first finite element in `xerr` and `yerr`.\r\n\r\n### Operating system\r\n\r\nDebian\r\n\r\n### Matplotlib Version\r\n\r\n3.6.2\r\n\r\n### Matplotlib Backend\r\n\r\nTkAgg\r\n\r\n### Python version\r\n\r\n3.9.2\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\npip","author":{"url":"https://github.com/MaximeLucasSky","@type":"Person","name":"MaximeLucasSky"},"datePublished":"2022-12-26T13:59:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/24818/matplotlib/issues/24818"}