René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Log Scale: FloatingPointError: underflow encountered in power","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\nWhen setting the scale to log on an empty axis while having numpy error handling set to raise, a FloatingPointError is thrown. When plotting data beforehand, everything works fine.\r\n\r\nThis is an issue for me, because I'm trying to plot multiple subplots with shared y axes after each other, where this issue occurs as well. For some reason in that context the error handling seems to bet set to raise.\r\n\r\nIssue #4285 is related but the stack trace is different and this issue is not dependent on data.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nnp.seterr(all=\"raise\")\r\n\r\n#plt.plot([1], [1])\r\nplt.yscale(\"log\")\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 \".../.PyCharmCE2019.2/config/scratches/scratch_44.py\", line 7, in \u003cmodule\u003e\r\n    plt.yscale(\"log\")\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/pyplot.py\", line 3088, in yscale\r\n    return gca().set_yscale(value, **kwargs)\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/axes/_base.py\", line 3711, in set_yscale\r\n    self.autoscale_view(scalex=False)\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/axes/_base.py\", line 2498, in autoscale_view\r\n    'minposy', self.yaxis, self._ymargin, y_stickies, self.set_ybound)\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/axes/_base.py\", line 2486, in handle_single_axis\r\n    x0, x1 = inverse_trans.transform([x0t, x1t])\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/transforms.py\", line 1394, in transform\r\n    res = self.transform_affine(self.transform_non_affine(values))\r\n  File \".../venv/lib/python3.6/site-packages/matplotlib/scale.py\", line 334, in transform_non_affine\r\n    return ma.power(self.base, a)\r\n  File \".../venv/lib/python3.6/site-packages/numpy/ma/core.py\", line 6717, in power\r\n    result = np.where(m, fa, umath.power(fa, fb)).view(basetype)\r\nFloatingPointError: underflow encountered in power\r\n```\r\n\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: Ubuntu 18.04\r\n  * Matplotlib version: 3.1.1\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version: 3.6.8\r\n  * Other libraries: Numpy == 1.17.2\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\nAll packages were installed using pip.\r\n","author":{"url":"https://github.com/ptoews","@type":"Person","name":"ptoews"},"datePublished":"2019-09-23T16:47:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/15331/matplotlib/issues/15331"}