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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Tutorial pyplot_scales.py crashes when used with plt.tight_layout()","articleBody":"Trying to replace `plt.subplots_adjust` with `plt.tight_layout` in the pyplot tutorial `pyplot_scales.py` (see #6779), seems to results in errors.\n- [x] Matplotlib version, Python version and Platform (Windows, OSX, Linux ...):\n- Linux (at least Archlinux and CentOs 7)\n- Tested on mpl 1.5.1 from Anaconda and mpl 2.0.0b3.post1799+ga4fdd60 from github\n- [x] MWE (kind of…):\n  Based on `pyplot_scales.py`:\n\n``` python\nimport numpy as np\nimport matplotlib.pyplot as plt\nplt.style.use('default')\n\n# make up some data in the interval ]0, 1[\ny = np.random.normal(loc=0.5, scale=0.4, size=1000)\ny = y[(y \u003e 0) \u0026 (y \u003c 1)]\ny.sort()\nx = np.arange(len(y))\n\nplt.figure(1)\nplt.subplot(221)\nplt.subplot(222)\nplt.subplot(223)\n\n# logit\nplt.subplot(224)\nplt.plot(x, y)\nplt.yscale('logit')\n#plt.subplots_adjust(top=0.92, bottom=0.08, left=0.10, right=0.95, hspace=0.25,\n#                    wspace=0.35)\nplt.tight_layout()\n\nplt.show()\n```\n\nWhen I run this example with `plt.tight_layout` instead of `plt.subplots_adjust` (or simply no subplot layout adjusting at all), I get these outputs (mpl 2.0.0b3.post1799+ga4fdd60):\n- with Qt4Agg backend\n\n```\nIn [1]: run pyplot_scales_mwe.py  # that's the MWE posted above\n/home/adrien/matplotlib/lib/matplotlib/transforms.py:380: RuntimeWarning: invalid value encountered in double_scalars\n  return points[1, 0] - points[0, 0]\n/home/adrien/matplotlib/lib/matplotlib/tight_layout.py:199: RuntimeWarning: invalid value encountered in double_scalars\n  kwargs[\"wspace\"] = hspace / h_axes\n/home/adrien/matplotlib/lib/matplotlib/axis.py:1008: UserWarning: Unable to find pixel distance along axis for interval padding of ticks; assuming no interval padding needed.\n  warnings.warn(\"Unable to find pixel distance along axis \"\n/home/adrien/matplotlib/lib/matplotlib/axis.py:1018: UserWarning: Unable to find pixel distance along axis for interval padding of ticks; assuming no interval padding needed.\n  warnings.warn(\"Unable to find pixel distance along axis \"\n\nTraceback (most recent call last):\n  File \"/home/adrien/matplotlib/lib/matplotlib/backends/backend_qt5agg.py\", line 182, in __draw_idle_agg\n    FigureCanvasAgg.draw(self)\n  File \"/home/adrien/matplotlib/lib/matplotlib/backends/backend_agg.py\", line 464, in draw\n    self.figure.draw(self.renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/figure.py\", line 1262, in draw\n    renderer, self, dsu, self.suppressComposite)\n  File \"/home/adrien/matplotlib/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\n    a.draw(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axes/_base.py\", line 2383, in draw\n    mimage._draw_list_compositing_images(renderer, self, dsu)\n  File \"/home/adrien/matplotlib/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\n    a.draw(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 1109, in draw\n    ticks_to_draw = self._update_ticks(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 942, in _update_ticks\n    tick_tups = [t for t in self.iter_ticks()]\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 885, in iter_ticks\n    majorLocs = self.major.locator()\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1721, in __call__\n    return self.tick_values(vmin, vmax)\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1726, in tick_values\n    locs = self._raw_ticks(vmin, vmax)\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1674, in _raw_ticks\n    nbins = max(min(self.axis.get_tick_space(), 9),\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 2008, in get_tick_space\n    return int(np.floor(length / size))\nValueError: cannot convert float NaN to integer\n```\n\nwhich results in\n![with_tight_layout](https://cloud.githubusercontent.com/assets/17270724/16909518/9f14f6e8-4cd3-11e6-9325-2e3ee803cf09.png)\n(NB: it's a screenshot because `savefig` complained about the “ValueError: cannot convert float NaN to integer” stuff)\n- with TkAgg backend\n\n```\nIn [1]: run pyplot_scales_mwe.py  # that's again the MWE posted above\n/home/adrien/matplotlib/lib/matplotlib/transforms.py:380: RuntimeWarning: invalid value encountered in double_scalars\n  return points[1, 0] - points[0, 0]\n/home/adrien/matplotlib/lib/matplotlib/tight_layout.py:199: RuntimeWarning: invalid value encountered in double_scalars\n  kwargs[\"wspace\"] = hspace / h_axes\n/home/adrien/matplotlib/lib/matplotlib/axis.py:1008: UserWarning: Unable to find pixel distance along axis for interval padding of ticks; assuming no interval padding needed.\n  warnings.warn(\"Unable to find pixel distance along axis \"\n/home/adrien/matplotlib/lib/matplotlib/axis.py:1018: UserWarning: Unable to find pixel distance along axis for interval padding of ticks; assuming no interval padding needed.\n  warnings.warn(\"Unable to find pixel distance along axis \"\n\nException in Tkinter callback\nTraceback (most recent call last):\n  File \"/home/adrien/anaconda/envs/Python2.7_matplotlib-git/lib/python2.7/lib-tk/Tkinter.py\", line 1536, in __call__\n    return self.func(*args)\n  File \"/home/adrien/matplotlib/lib/matplotlib/backends/backend_tkagg.py\", line 283, in resize\n    self.show()\n  File \"/home/adrien/matplotlib/lib/matplotlib/backends/backend_tkagg.py\", line 354, in draw\n    FigureCanvasAgg.draw(self)\n  File \"/home/adrien/matplotlib/lib/matplotlib/backends/backend_agg.py\", line 464, in draw\n    self.figure.draw(self.renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/figure.py\", line 1262, in draw\n    renderer, self, dsu, self.suppressComposite)\n  File \"/home/adrien/matplotlib/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\n    a.draw(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axes/_base.py\", line 2383, in draw\n    mimage._draw_list_compositing_images(renderer, self, dsu)\n  File \"/home/adrien/matplotlib/lib/matplotlib/image.py\", line 139, in _draw_list_compositing_images\n    a.draw(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/artist.py\", line 68, in draw_wrapper\n    return draw(artist, renderer, *args, **kwargs)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 1109, in draw\n    ticks_to_draw = self._update_ticks(renderer)\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 942, in _update_ticks\n    tick_tups = [t for t in self.iter_ticks()]\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 885, in iter_ticks\n    majorLocs = self.major.locator()\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1721, in __call__\n    return self.tick_values(vmin, vmax)\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1726, in tick_values\n    locs = self._raw_ticks(vmin, vmax)\n  File \"/home/adrien/matplotlib/lib/matplotlib/ticker.py\", line 1674, in _raw_ticks\n    nbins = max(min(self.axis.get_tick_space(), 9),\n  File \"/home/adrien/matplotlib/lib/matplotlib/axis.py\", line 2008, in get_tick_space\n    return int(np.floor(length / size))\nValueError: cannot convert float NaN to integer\n```\n\nwhich produces an empty figure.\n- [x] If this is an image generation bug attach a screenshot demonstrating the issue:\n  See above.\n- [x] If this is a regression (Used to work in an earlier version of Matplotlib), please \n    note where it used to work:\n  The behavior seems to be the same with mpl 1.5.1 and (at least) both TkAgg and Qt4Agg backends.\n","author":{"url":"https://github.com/afvincent","@type":"Person","name":"afvincent"},"datePublished":"2016-07-18T08:46:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/6789/matplotlib/issues/6789"}