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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pcolormesh x-axis with datetime broken for nearest shading","articleBody":"### Bug report\r\n\r\n\r\n**Bug summary**\r\n\r\nWhen using a datetime x-axis in a pcolormesh, and nearest shading,\r\n\r\n \u003e TypeError: '\u003e=' not supported between instances of 'datetime.timedelta' and 'int'\r\n\r\nis raised.\r\n\r\nFrom what I can tell, #18398 assumed comparison with 0 would always be possible, but this isn't the case for `datetime.timedelta`.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nfrom datetime import datetime\r\n\r\nfrom matplotlib import pyplot as plt\r\n\r\nx_coords = [datetime.fromtimestamp(x * 3600) for x in range(24)]\r\ny_coords = [*range(0, 10)]\r\nplt.pcolormesh(x_coords,\r\n               y_coords, [[*range(24)] for _ in range(10)],\r\n               shading=\"nearest\")\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \".local/lib/python3.8/site-packages/matplotlib/pyplot.py\", line 2801, in pcolormesh\r\n    __ret = gca().pcolormesh(\r\n  File \".local/lib/python3.8/site-packages/matplotlib/__init__.py\", line 1438, in inner\r\n    return func(ax, *map(sanitize_sequence, args), **kwargs)\r\n  File \".local/lib/python3.8/site-packages/matplotlib/axes/_axes.py\", line 6093, in pcolormesh\r\n    X, Y, C, shading = self._pcolorargs('pcolormesh', *args,\r\n  File \".local/lib/python3.8/site-packages/matplotlib/axes/_axes.py\", line 5651, in _pcolorargs\r\n    X = _interp_grid(X)\r\n  File \".local/lib/python3.8/site-packages/matplotlib/axes/_axes.py\", line 5633, in _interp_grid\r\n    if not (np.all(dX \u003e= 0) or np.all(dX \u003c= 0)):\r\nTypeError: '\u003e=' not supported between instances of 'datetime.timedelta' and 'int'\r\n```\r\n\r\n**Expected outcome**\r\n\r\nNone\r\n\r\n**Matplotlib version**\r\n\r\n  * Matplotlib version: 3.3.2\r\n  * Python version: 3.8\r\n\r\nworks with `pip3 install matplotlib==3.3.1`, fails with `pip3 install matplotlib==3.3.2`\r\n","author":{"url":"https://github.com/fthyssen","@type":"Person","name":"fthyssen"},"datePublished":"2020-09-23T09:15:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/18547/matplotlib/issues/18547"}