René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Locators: First visible tick does not have `pos=0`","articleBody":"I noticed that various Locators have problems designating `pos=0` to the first visible tick. While this might not be very important for most people, I still thought I'd mention it here.\n\nFor `AutoDateLocator` this happens below a certain threshold of x range. Below an x range of around 5e-5 (equal to approximately 5 seconds) the tick with position 0 is not inside the plot anymore.\nI admit that this is a rather low value for date plots and thus might be considered very low priority.\n\nFor `AutoLocator` this seems to be a general problem. Almost always the first visible tick has position 1.\n\nThe following script demonstrates both cases. Zoom in/out on x axes and look at  `pos` of the first tick.\n\n``` python\nimport matplotlib.pyplot as plt\nfrom matplotlib.ticker import FuncFormatter\nfrom numpy.random import randn\n\n\ndef print_pos(x, pos=None):\n    return \"%s: %s\" % (str(pos), str(x))\n\n\nfig = plt.figure(figsize=(16, 6))\nfig.suptitle(\"xticklabels are 'pos: x'\")\n\nax = fig.add_subplot(211)\nleft = 10\nright = left + 6e-5\nax.plot_date([left, right], [1, 1])\nax.xaxis.set_major_formatter(FuncFormatter(print_pos))\nax.set_title(\"zoom in: leftmost tick has position 1\")\n\nax = fig.add_subplot(212)\nax.plot(randn(20), randn(20))\nax.xaxis.set_major_formatter(FuncFormatter(print_pos))\nax.set_title(\"zoom in/out: leftmost tick has position 1\")\n\nplt.show()\n```\n","author":{"url":"https://github.com/megies","@type":"Person","name":"megies"},"datePublished":"2013-10-10T09:04:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/2509/matplotlib/issues/2509"}