René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Reactivating `pyplot.subplot` throws warning.","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\nRunning `plt.subplot` after the respective subplot has already been created shows a warning. This behaviour is expected for `fig.add_subplot`. However in pyplot this is to my knowledge the recommended way to activate a subplot, as seen from [the tutorial](https://matplotlib.org/tutorials/introductory/pyplot.html#working-with-multiple-figures-and-axes).\r\n\r\n**Code for reproduction**\r\n\r\nThe following is the code from the second code box in the [Working with multiple figures and axes](https://matplotlib.org/tutorials/introductory/pyplot.html#working-with-multiple-figures-and-axes) section of the basic pyplot guide.\r\n\r\n```\r\nimport matplotlib.pyplot as plt\r\nplt.figure(1)                # the first figure\r\nplt.subplot(211)             # the first subplot in the first figure\r\nplt.plot([1, 2, 3])\r\nplt.subplot(212)             # the second subplot in the first figure\r\nplt.plot([4, 5, 6])\r\n\r\n\r\nplt.figure(2)                # a second figure\r\nplt.plot([4, 5, 6])          # creates a subplot(111) by default\r\n\r\nplt.figure(1)                # figure 1 current; subplot(212) still current\r\nplt.subplot(211)             # make subplot(211) in figure1 current\r\nplt.title('Easy as 1, 2, 3') # subplot 211 title\r\n```\r\n\r\n**Actual outcome**\r\n\r\nWhen being run it produces a warning.\r\n\r\n\u003e MatplotlibDeprecationWarning: Adding an axes using the same arguments as a previous axes currently reuses the earlier instance.  In a future version, a new instance will always be created and returned.  Meanwhile, this warning can be suppressed, and the future behavior ensured, by passing a unique label to each axes instance.\r\n\r\n\r\n**Expected outcome**\r\n\r\nNo warning. Using `pyplot.subplot(211)` should just activate the subplot, as described in the tutorial. \r\n\r\nAlternatively, there needs to be another way to activate a subplot in pyplot (without having stored any handle to it previously).\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\r\n  * Matplotlib version: 2.2.2, 3.0.0 (possibly others)\r\n\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\n\r\n","author":{"url":"https://github.com/ImportanceOfBeingErnest","@type":"Person","name":"ImportanceOfBeingErnest"},"datePublished":"2018-10-13T03:10:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":21},"url":"https://github.com/12513/matplotlib/issues/12513"}