【R】katex
2021年7月2日
1. はじめに
katexは、texのコードをmarkdown等で扱いやすいようにhtml形式に変換してくれるパッケージです。
2. インストール
options(repos = c(
ropensci = 'https://ropensci.r-universe.dev',
CRAN = 'https://cloud.r-project.org'))
install.packages('katex')3. つかってみる
texの例があります。
example_math()
> example_math()
[1] "f(x)= {\\frac{1}{\\sigma\\sqrt{2\\pi}}}e^{- {\\frac {1}{2}} (\\frac {x-\\mu}{\\sigma})^2}"これをhtml形式に変換します。
html <- render_html(example_math(), preview = interactive())
するとRstudioではViewにこのように表示されます。
htmlはこのように出力されます。
html
[1] "<span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\" display=\"block\"><semantics><mrow><mi>f</mi><mo stretchy=\"false\">(</mo><mi>x</mi><mo stretchy=\"false\">)</mo><mo>=</mo><mfrac><mn>1</mn><mrow><mi>σ</mi><msqrt><mrow><mn>2</mn><mi>π</mi></mrow></msqrt></mrow></mfrac><msup><mi>e</mi><mrow><mo>−</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo stretchy=\"false\">(</mo><mfrac><mrow><mi>x</mi><mo>−</mo><mi>μ</mi></mrow><mi>σ</mi></mfrac><msup><mo stretchy=\"false\">)</mo><mn>2</mn></msup></mrow></msup></mrow><annotation encoding=\"application/x-tex\">f(x)= {\\frac{1}{\\sigma\\sqrt{2\\pi}}}e^{- {\\frac {1}{2}} (\\frac {x-\\mu}{\\sigma})^2}</annotation></semantics></math></span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"strut\" style=\"height:1em;vertical-align:-0.25em;\"></span><span class=\"mord mathnormal\" style=\"margin-right:0.10764em;\">f</span><span class=\"mopen\">(</span><span class=\"mord mathnormal\">x</span><span class=\"mclose\">)</span><span class=\"mspace\" style=\"margin-right:0.2777777777777778em;\"></span><span class=\"mrel\">=</span><span class=\"mspace\" style=\"margin-right:0.2777777777777778em;\"></span></span><span class=\"base\"><span class=\"strut\" style=\"height:2.25144em;vertical-align:-0.93em;\"></span><span class=\"mord\"><span class=\"mord\"><span class=\"mopen nulldelimiter\"></span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:1.32144em;\"><span style=\"top:-2.2027799999999997em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"mord\"><span class=\"mord mathnormal\" style=\"margin-right:0.03588em;\">σ</span><span class=\"mord sqrt\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.90722em;\"><span class=\"svg-align\" style=\"top:-3em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"mord\" style=\"padding-left:0.833em;\"><span class=\"mord\">2</span><span class=\"mord mathnormal\" style=\"margin-right:0.03588em;\">π</span></span></span><span style=\"top:-2.86722em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"hide-tail\" style=\"min-width:0.853em;height:1.08em;\"><svg width='400em' height='1.08em' viewBox='0 0 400000 1080' preserveAspectRatio='xMinYMin slice'><path d='M95,702\nc-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14\nc0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54\nc44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10\ns173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429\nc69,-144,104.5,-217.7,106.5,-221\nl0 -0\nc5.3,-9.3,12,-14,20,-14\nH400000v40H845.2724\ns-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7\nc-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47z\nM834 80h400000v40h-400000z'/></svg></span></span></span><span class=\"vlist-s\"></span></span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.13278em;\"><span></span></span></span></span></span></span></span><span style=\"top:-3.23em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"frac-line\" style=\"border-bottom-width:0.04em;\"></span></span><span style=\"top:-3.677em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"mord\"><span class=\"mord\">1</span></span></span></span><span class=\"vlist-s\"></span></span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.93em;\"><span></span></span></span></span></span><span class=\"mclose nulldelimiter\"></span></span></span><span class=\"mord\"><span class=\"mord mathnormal\">e</span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:1.0369199999999998em;\"><span style=\"top:-3.4130000000000003em;margin-right:0.05em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">−</span><span class=\"mord mtight\"><span class=\"mord mtight\"><span class=\"mopen nulldelimiter sizing reset-size3 size6\"></span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.8443142857142858em;\"><span style=\"top:-2.656em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"sizing reset-size3 size1 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">2</span></span></span></span><span style=\"top:-3.2255000000000003em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"frac-line mtight\" style=\"border-bottom-width:0.049em;\"></span></span><span style=\"top:-3.384em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"sizing reset-size3 size1 mtight\"><span class=\"mord mtight\"><span class=\"mord mtight\">1</span></span></span></span></span><span class=\"vlist-s\"></span></span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.344em;\"><span></span></span></span></span></span><span class=\"mclose nulldelimiter sizing reset-size3 size6\"></span></span></span><span class=\"mopen mtight\">(</span><span class=\"mord mtight\"><span class=\"mopen nulldelimiter sizing reset-size3 size6\"></span><span class=\"mfrac\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.87905em;\"><span style=\"top:-2.656em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"sizing reset-size3 size1 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\" style=\"margin-right:0.03588em;\">σ</span></span></span></span><span style=\"top:-3.2255000000000003em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"frac-line mtight\" style=\"border-bottom-width:0.049em;\"></span></span><span style=\"top:-3.4623857142857144em;\"><span class=\"pstrut\" style=\"height:3em;\"></span><span class=\"sizing reset-size3 size1 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\">x</span><span class=\"mbin mtight\">−</span><span class=\"mord mathnormal mtight\">μ</span></span></span></span></span><span class=\"vlist-s\"></span></span><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.344em;\"><span></span></span></span></span></span><span class=\"mclose nulldelimiter sizing reset-size3 size6\"></span></span><span class=\"mclose mtight\"><span class=\"mclose mtight\">)</span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height:0.8913142857142857em;\"><span style=\"top:-2.931em;margin-right:0.07142857142857144em;\"><span class=\"pstrut\" style=\"height:2.5em;\"></span><span class=\"sizing reset-size3 size1 mtight\"><span class=\"mord mtight\">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>"htmlに埋め込むと
f(x)=σ2π1e−21(σx−μ)24. さいごに
重宝しそうなパッケージです。
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