René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Use `\\genfrac` in display style?","articleBody":"### Problem\n\nIs it possible to render fractions in display style using `\\genfrac`?\r\n\r\nThe `style` argument of the `_genfrac` function in `_mathtext.py` is received as an `Hlist`. As a result, fractions will never use display style (since `style` and `self._MathStyle.DISPLAYSTYLE` will always compare unequal).\r\n\r\n```\r\nimport matplotlib.pyplot as plt\r\n\r\nfig = plt.figure()\r\nfig.text(.2, .5, r'$\\genfrac{}{}{0}{0}{1}{2}$')\r\nfig.text(.3, .5, r'$\\genfrac{}{}{1}{1}{1}{2}$')\r\nplt.show()\r\n```\n\n### Proposed solution\n\nChange\r\n```\r\n        p.genfrac \u003c\u003c= r\"\\genfrac\" - (\r\n            \"{\" + Optional(p.ambi_delim | p.left_delim)(\"ldelim\") + \"}\"\r\n            + \"{\" + Optional(p.ambi_delim | p.right_delim)(\"rdelim\") + \"}\"\r\n            + \"{\" + p.float_literal(\"rulesize\") + \"}\"\r\n            + p.simple_group(\"style\")                    # \u003c- change this line\r\n            + p.required_group(\"num\")\r\n            + p.required_group(\"den\")\r\n            | Error(\"Expected \"\r\n                    r\"\\genfrac{ldelim}{rdelim}{rulesize}{style}{num}{den}\"))\r\n\r\n```\r\nto\r\n```\r\n        p.genfrac \u003c\u003c= r\"\\genfrac\" - (\r\n            \"{\" + Optional(p.ambi_delim | p.left_delim)(\"ldelim\") + \"}\"\r\n            + \"{\" + Optional(p.ambi_delim | p.right_delim)(\"rdelim\") + \"}\"\r\n            + \"{\" + p.float_literal(\"rulesize\") + \"}\"\r\n            + \"{\" + p.int_literal(\"style\") + \"}\"                    # \u003c- changed this line\r\n            + p.required_group(\"num\")\r\n            + p.required_group(\"den\")\r\n            | Error(\"Expected \"\r\n                    r\"\\genfrac{ldelim}{rdelim}{rulesize}{style}{num}{den}\"))\r\n```\r\nwith `p.int_literal` defined using a regex (just like how `p.float_literal` is defined), following which, the `_genfrac` function should obtain the enumeration variable from the value. We can hard-code the enumerations\r\n```\r\ndisplay_style = 0\r\ntext_style = 2\r\nscript_style = 4\r\nscript_script_style = 6\r\n```\r\nsince those are the values specified in _TeX: The Program_.\r\n\r\nI could try to create a PR for this, but my knowledge of language parsing is very limited.","author":{"url":"https://github.com/tfpf","@type":"Person","name":"tfpf"},"datePublished":"2022-05-08T03:23:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/23008/matplotlib/issues/23008"}