René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Remove()ing a shared axes prevents the remaining axes from using unit-provided formatters","articleBody":"Consider\r\n```\r\nfrom pylab import *\r\nfrom datetime import date\r\n\r\nfig, axs = plt.subplots(1, 2, sharex=True)\r\naxs[1].remove()\r\naxs[0].plot([date(2000, 1, 1), date(2000, 2, 1)], [0, 1])\r\nplt.show()\r\n```\r\n\r\nOne gets\r\n![test](https://user-images.githubusercontent.com/1322974/48794454-4c3f5c00-ecfa-11e8-9e1f-83ff6015782c.png)\r\n\r\ni.e. the call to `axs[1].remove()` prevented the axs[0] from acquiring the correct tick formatter and locator.\r\n\r\nInterestingly, using `fig.delaxes(axs[1])` doesn't exhibit the same bug.\r\n\r\nLooks like the problem comes from\r\n```\r\n    def _remove_ax(self, ax):\r\n        def _reset_loc_form(axis):\r\n            axis.set_major_formatter(axis.get_major_formatter())\r\n            axis.set_major_locator(axis.get_major_locator())\r\n            axis.set_minor_formatter(axis.get_minor_formatter())\r\n            axis.set_minor_locator(axis.get_minor_locator())\r\n\r\n        def _break_share_link(ax, grouper):\r\n            siblings = grouper.get_siblings(ax)\r\n            if len(siblings) \u003e 1:\r\n                grouper.remove(ax)\r\n                for last_ax in siblings:\r\n                    if ax is not last_ax:\r\n                        return last_ax\r\n            return None\r\n\r\n        self.delaxes(ax)\r\n        last_ax = _break_share_link(ax, ax._shared_y_axes)\r\n        if last_ax is not None:\r\n            _reset_loc_form(last_ax.yaxis)\r\n\r\n        last_ax = _break_share_link(ax, ax._shared_x_axes)\r\n        if last_ax is not None:\r\n            _reset_loc_form(last_ax.xaxis)\r\n```\r\nwhere the call to `set_major_formatter` (etc.), which basically call `formatter.set_axis(axis)` (to update the axis seen by the formatter) also make Matplotlib believe that we had a user-provided formatter (isDefault_majloc = False, etc.) which should not be overridden by the unit framework.\r\n\r\nmpl master (ca. 3.0.2)","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2018-11-20T18:28:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/12853/matplotlib/issues/12853"}