René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Confusing error on fully commented-out usetex strings","articleBody":"### Bug report\r\nI was trying to generate some figures using the latex fonts (rc('text', usetex=True)), but I always get an error (I also tried on linux).  If I set usetex=False, no error is raised and the figure is properly generated, even the tex characters are generated.\r\n\r\nIf the figure is not composed by subplots, no error is raised, so, I think is something between subplots and tex.\r\n\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\nfrom matplotlib import rc, gridspec\r\nimport matplotlib.pyplot as plt\r\nfrom numpy.random.mtrand import randint\r\nfrom numpy import linspace\r\nimport matplotlib.ticker as mtick\r\n\r\nfig = plt.figure(tight_layout=True, figsize=(9, 6))\r\nrc('text', usetex=True)\r\ngs = gridspec.GridSpec(2, 2)\r\naxs = [ fig.add_subplot(gs[0, :]), fig.add_subplot(gs[1, 0]), fig.add_subplot(gs[1, 1])]\r\ncolors = ['royalblue', 'darkorange']\r\n\r\nall_names = [['TEXT$_1$-A', 'TEXT$_1$-B'], ['TEXT$_2$-A', 'TEXT_2-B']]\r\n\r\nfor names in all_names:\r\n    y_plot = randint(-50, 50, 5000)\r\n    x_plot = linspace(0, 100, len(y_plot))\r\n    \r\n    ax = axs[0]\r\n    ax.plot(x_plot, y_plot, label='{} / {}'.format(*names) if len(all_names) \u003e 1 else None)\r\n    \r\n    ax.set_xlabel(\"% of instances\")\r\n    ax.set_yscale('symlog')\r\n    \r\n    ax.set_ylabel('ratio'.format(*names))\r\n    ax.legend(loc='upper right')\r\n\r\n    ax.xaxis.set_major_locator(mtick.MultipleLocator(25))\r\n    ax.xaxis.set_minor_locator(mtick.MultipleLocator(5))\r\n    ax.xaxis.set_major_formatter(mtick.PercentFormatter(100))\r\n    ax.grid(True, which='Major', axis='both', linestyle='--', color='silver')\r\n    \r\n    ax = axs[1]\r\n    ax.plot(x_plot, y_plot, label=r'{} / {}'.format(*names) if len(all_names) \u003e 1 else None)\r\n    ax.set_xlim(0, 5)    \r\n    ax.grid(True, which='both', axis='both', linestyle='--', color='silver')\r\n    ax.set_yscale('linear')\r\n\r\n    ax = axs[2]\r\n    ax.plot(x_plot, y_plot, label=r'{} / {}'.format(*names) if len(all_names) \u003e 1 else None)\r\n    ax.set_yscale('log')\r\n    ax.set_xlim(95, 100)\r\n    ax.grid(True, which='Major', axis='both', linestyle='--', color='silver')\r\n    ax.xaxis.set_major_locator(mtick.MultipleLocator(5))\r\n    ax.xaxis.set_minor_locator(mtick.MultipleLocator(1))\r\n    ax.xaxis.set_major_formatter(mtick.PercentFormatter(100))\r\n    ax.xaxis.set_minor_formatter(mtick.PercentFormatter(100))\r\n\r\nfig.align_labels()\r\nplt.tight_layout()\r\nplt.show()\r\n\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"C:\\research\\accasim-tests\\new_model\\analysis\\tex_error.py\", line 52, in \u003cmodule\u003e\r\n    plt.tight_layout()\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\pyplot.py\", line 1368, in tight_layout\r\n    gcf().tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\figure.py\", line 2476, in tight_layout\r\n    pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\tight_layout.py\", line 362, in get_tight_layout_figure\r\n    pad=pad, h_pad=h_pad, w_pad=w_pad)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\tight_layout.py\", line 111, in auto_adjust_subplotpars\r\n    tight_bbox_raw = union([ax.get_tightbbox(renderer) for ax in subplots\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\tight_layout.py\", line 112, in \u003clistcomp\u003e\r\n    if ax.get_visible()])\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\axes\\_base.py\", line 4357, in get_tightbbox\r\n    bb_xaxis = self.xaxis.get_tightbbox(renderer)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\axis.py\", line 1178, in get_tightbbox\r\n    *ticklabelBoxes2,\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\axis.py\", line 1176, in \u003cgenexpr\u003e\r\n    if a.get_visible()),\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\text.py\", line 890, in get_window_extent\r\n    bbox, info, descent = self._get_layout(self._renderer)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\text.py\", line 298, in _get_layout\r\n    clean_line, self._fontproperties, ismath=ismath)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\backends\\backend_agg.py\", line 201, in get_text_width_height_descent\r\n    s, fontsize, renderer=self)\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\texmanager.py\", line 449, in get_text_width_height_descent\r\n    with dviread.Dvi(dvifile, 72 * dpi_fraction) as dvi:\r\n  File \"C:\\Program Files\\Python36\\lib\\site-packages\\matplotlib\\dviread.py\", line 198, in __init__\r\n    self.file = open(filename, 'rb')\r\nFileNotFoundError: [Errno 2] No such file or directory: 'C:\\\\Users\\\\cgall\\\\.matplotlib\\\\tex.cache\\\\aee1b2d0939944ebcda4231dd9a1549a.dvi'\r\n```\r\n\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: Win 10\r\n  * Matplotlib version: 3.1.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version: 3.6\r\n  * Other libraries: numpy 1.16.3\r\n\r\nMatplotlib installed via pip command\r\n","author":{"url":"https://github.com/cgalleguillosm","@type":"Person","name":"cgalleguillosm"},"datePublished":"2020-02-04T21:28:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/16409/matplotlib/issues/16409"}