René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: `get_ticklabels`/`set_ticklabels` gives incorrect values in log plot","articleBody":"### Bug summary\n\nIn a certain scenario, adjusting the `ylim` of a log plot and updating the `yticklabels` gives numerically incorrect ticks while still plotting the correct values. We were calling `get_`/`set_yticklabels` because the `cmss10` font didn't have a certain glyph which needed to be replaced, but the bug can be reproduced with the more minimal code below.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\r\n\r\nplt.rcParams.update({\r\n    \"figure.figsize\": (6, 2),\r\n    \"font.size\": 12,\r\n    \"font.family\": \"cmss10\",\r\n})\r\n\r\nx = ['A', 'B', 'C']\r\ny = [10, 1000, 10000]\r\n\r\nfig, ax = plt.subplots(layout='constrained')\r\n\r\n# Plot and label data\r\nb = ax.bar(x, y)\r\nax.bar_label(b, y)\r\n\r\n# Log scale for vertical axis\r\nax.set_yscale('log')\r\n\r\n# Give a bit extra space for the labels\r\nplt.ylim(None, plt.ylim()[1] * 8)\r\n\r\n# Originally was using this to replace special characters in the font\r\nax.set_yticklabels(ax.get_yticklabels())\r\n\r\nplt.savefig('bug-output.png', dpi=300)\n```\n\n\n### Actual outcome\n\n![bug-output](https://github.com/user-attachments/assets/d5afe930-995f-4bc2-acba-0a7003d25332)\r\n\r\nThe y-axis ticks are incorrectly labeled.\n\n### Expected outcome\n\n\r\n\r\n![bug-output](https://github.com/user-attachments/assets/0056b3b4-eb43-495f-89f5-1b916b3a1b3b)\r\n\n\n### Additional information\n\nChanging `plt.ylim(None, plt.ylim()[1] * 8)` to `plt.ylim(None, plt.ylim()[1] * 7)` (that is, just a bit less extra room) fixes the issue. Granted, most other sets of changes also fix it: this appears to be an extremely idiosyncratic bug, so I'm not clear what the real issue is. Changing the plot size, removing `'constrained'`, changing the font, removing the `ylim` statement entirely... these all appear to fix it. It's just the specific combination of parameters that we happened to stumble into this.\n\n### Operating system\n\nMac OS\n\n### Matplotlib Version\n\n3.9.3\n\n### Matplotlib Backend\n\nmacosx\n\n### Python version\n\n3.10.2\n\n### Jupyter version\n\nN/A\n\n### Installation\n\npip","author":{"url":"https://github.com/elimbaum","@type":"Person","name":"elimbaum"},"datePublished":"2024-12-11T14:58:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/29284/matplotlib/issues/29284"}