René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: undefined \\mathdefault","articleBody":"### Bug summary\r\n\r\nIf we `\\input` the pgf file created by matplotlib with pgf backend, it assumes `\\mathdefault` to exist. But unfortunately, this command is not provided by any of the recommended packages as far as I see: to produce the actual `pdf` file, matplotlib seems to actually define it manually like:\r\n```\r\n\\def\\mathdefault#1{#1}\r\n```\r\nas can be read from the automatically generated .pgf file… Manually adding this line in the .tex file before the `\\input` works as a workaround, but this seems like a dirty workaround as this is not documented as far as I can see.\r\n\r\nWould it be possible to either document it or provide these commands in a properly packaged latex library?\r\n\r\nSee also this discussion https://github.com/leo-colisson/robust-externalize/issues/31\r\n\r\n### Code for reproduction\r\n\r\n```Python\r\nimport matplotlib.pyplot as plt\r\nimport matplotlib\r\nmatplotlib.use('pgf')\r\n\r\n\r\nplt.rcParams.update({ \r\n    \"text.usetex\": True, \r\n})\r\nplt.rcParams.update({ \r\n    \"pgf.preamble\": \"\\n\".join([\r\n        r\"\\usepackage{fontspec}\",\r\n        r\"\\usepackage{amsmath}\",\r\n        r\"\\usepackage{amssymb}\",\r\n    ]),\r\n})\r\n\r\nplt.rcParams['text.latex.preamble'] = r'\\newcommand{\\mathdefault}[1][]{}'  # doesn't seem to work.\r\n\r\nyear = [2014, 2015, 2016, 2017, 2018, 2019]\r\ntutorial_count = [39, 117, 111, 110, 67, 29]\r\nplt.plot(year, tutorial_count, color=\"#6c3376\", linewidth=2)\r\nplt.title(\"Simple plot\")\r\nplt.xlabel('Year')\r\nplt.ylabel('Number of futurestud.io Tutorials')\r\n\r\nplt.savefig(\"foo.pgf\", bbox_inches=\"tight\")\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\nI would expect `\\input` of the pgf file to work, but it is not. Here is the full file I use to both compile the python and include it (using the recent robust-externalize library, you might need to copy the .sty from to install it and you might want to compile with `-shell-escape` for simplicity)\r\n\r\n```\r\n\\documentclass{article} \r\n\\usepackage{lipsum}\r\n\\usepackage{tikz}\r\n\\usepackage{robust-externalize}\r\n\\robExtConfigure{enable fallback to manual mode} % prints a helpful message in the document if you forgot --shell-escape\r\n%% If you do not add this line, this will return an error:\r\n%\\def\\mathdefault#1{#1}\r\n\\begin{document}\r\n\r\n\\lipsum[1]\r\n\r\n\\begin{figure}[ht]\r\n  \\centering\r\n  \\begin{CacheMeCode}{python, custom include command={\\input{\\robExtAddCachePathAndName{\\robExtFinalHash.pgf}}}, set placeholder eval={__LINEWIDTH__}{\\lenToCmNoUnit[in]{\\linewidth}}}\r\n    import matplotlib.pyplot as plt\r\n    import matplotlib\r\n    from matplotlib.pyplot import figure\r\n    matplotlib.use(\"pgf\")\r\n    # See this link for details on how to preview the image in jupyter\r\n    # https://matplotlib.org/stable/users/explain/text/pgf.html\r\n    matplotlib.rcParams.update({\r\n      \"font.family\": \"serif\",\r\n      \"font.serif\": [], # Use LaTeX default serif font.\r\n      \"text.usetex\": True, # use inline math for ticks\r\n    })\r\n\r\n    figure(figsize=(__LINEWIDTH__, 0.7*__LINEWIDTH__))\r\n    year = [2014, 2015, 2016, 2017, 2018, 2019]\r\n    tutorial_count = [39, 117, 111, 110, 67, 29]\r\n    plt.plot(year, tutorial_count, color=\"#6c3376\", linewidth=2)\r\n    plt.title(\"Simple plot for $\\delta = 2$\")\r\n    plt.xlabel('Year')\r\n    plt.ylabel('Number of futurestud.io Tutorials')\r\n    print(get_filename_from_extension(\".pgf\"))\r\n    # https://stackoverflow.com/a/52587591/4987648\r\n    plt.savefig(get_filename_from_extension(\".pgf\"), bbox_inches=\"tight\")\r\n  \\end{CacheMeCode}\r\n  \\caption{Test}%\r\n\\end{figure}\r\n\r\n\\end{document}\r\n\r\n% Local Variables:\r\n% TeX-command-extra-options: \"--shell-escape -halt-on-error\"\r\n% End:\r\n```\r\n\r\n### Expected outcome\r\n\r\nI expect the use of `\\def\\mathdefault#1{#1}` to be at least documented, ideally automatically defined in the `.pgf` file if the command does not already exist with something like:\r\n```\r\n\\providecommand\\mathdefault[1]{#1}\r\n```\r\n\r\n### Additional information\r\n\r\nThis seems to be a regression, as it used not to be a problem on 3.7 I think.\r\n\r\n### Operating system\r\n\r\nNixOs\r\n\r\n### Matplotlib Version\r\n\r\n3.8.2\r\n\r\n### Matplotlib Backend\r\n\r\npgf\r\n\r\n### Python version\r\n\r\n3.11.8\r\n\r\n### Jupyter version\r\n\r\nNot using jupyter\r\n\r\n### Installation\r\n\r\nLinux package manager","author":{"url":"https://github.com/tobiasBora","@type":"Person","name":"tobiasBora"},"datePublished":"2024-03-11T13:24:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/27907/matplotlib/issues/27907"}