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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pcolor deprecation warning with default settings","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`pcolor()` produces a deprecation warning with default settings.\r\n\r\nThe default of `rcParams['pcolor.shading']` seems to be `'flat'`, which is deprecated (at least sometimes). Maybe the default should be changed to `'auto'` or `'nearest'`?\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nfrom matplotlib import pyplot as plt\r\nimport numpy as np\r\n\r\nx = np.arange(2.)\r\ny = np.arange(2.)\r\nz = np.ones([2,2])\r\n\r\nplt.pcolor(x,y,z)\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```\r\nMatplotlibDeprecationWarning: shading='flat' when X and Y have the same dimensions as C is deprecated since 3.3.  Either specify the corners of the quadrilaterals with X and Y, or pass shading='auto', 'nearest' or 'gouraud', or set rcParams['pcolor.shading'].  This will become an error two minor releases later.\r\n  plt.pcolor(x,y,z)\r\n```\r\n\r\n**Expected outcome**\r\n\r\nNo warning\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: Linux Mint 19\r\n  * Matplotlib version: 3.3.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.7.6\r\n  * Jupyter version (if applicable): N/A\r\n  * Other libraries: None\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\nInstalled with conda from conda-forge\r\n","author":{"url":"https://github.com/johnomotani","@type":"Person","name":"johnomotani"},"datePublished":"2020-09-22T20:14:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/18546/matplotlib/issues/18546"}