**R**

Here I replicated the code from the official Shiny example linked above. The magic code is inserted into ui.R, just below

`withMathJax()`.

## ui.R

library(shiny) shinyUI(fluidPage( title = 'MathJax Examples with in-line equations', withMathJax(), # section below allows in-line LaTeX via $ in mathjax. Replace less-than-sign with < # and grater-than-sign with > tags$div(HTML("less-than-sign script type='text/x-mathjax-config' greater-than-sign MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]} }); less-than-sign /script greater-than-sign ")), helpText('An irrational number $\\sqrt{2}$ and a fraction $1-\\frac{1}{2}$'), helpText('and a fact about $\\pi$:$\\frac2\\pi = \\frac{\\sqrt2}2 \\cdot \\frac{\\sqrt{2+\\sqrt2}}2 \\cdot \\frac{\\sqrt{2+\\sqrt{2+\\sqrt2}}}2 \\cdots$'), uiOutput('ex1'), uiOutput('ex2'), uiOutput('ex3'), uiOutput('ex4'), checkboxInput('ex5_visible', 'Show Example 5', FALSE), uiOutput('ex5') )) ## server.R library(shiny) shinyServer(function(input, output, session) { output$ex1 <- renderUI({ withMathJax(helpText('Dynamic output 1: $\\alpha^2$')) }) output$ex2 <- renderUI({ withMathJax( helpText('and output 2 $3^2+4^2=5^2$'), helpText('and output 3 $\\sin^2(\\theta)+\\cos^2(\\theta)=1$') ) }) output$ex3 <- renderUI({ withMathJax( helpText('The busy Cauchy distribution $\\frac{1}{\\pi\\gamma\\,\\left[1 + \\left(\\frac{x-x_0}{\\gamma}\\right)^2\\right]}\\!$')) }) output$ex4 <- renderUI({ invalidateLater(5000, session) x <- round(rcauchy(1), 3) withMathJax(sprintf("If $X$ is a Cauchy random variable, then $P(X \\leq %.03f ) = %.03f$", x, pcauchy(x))) }) output$ex5 <- renderUI({ if (!input$ex5_visible) return() withMathJax( helpText('You do not see me initially: $e^{i \\pi} + 1 = 0$') ) }) })Give it a try (or check out the Shiny app at https://r.amherst.edu/apps/nhorton/mathjax/)! One caveat is that the other means of in-line display, as shown in the official example, doesn't work when the MathJax HTML is inserted as above.

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## 3 comments:

The text above didn't work for me. It looks like there is something missing in the

tags$div(HTML("

"))

I was successful configuring MathJax correctly using

tags$script("

MathJax.Hub.Config({

tex2jax: {

inlineMath: [['$','$'], ['\\(','\\)']],

processEscapes: true

}

});"

)

Yes, that's not displaying correctly any longer! Thanks for bringing it to my attention!

Is there an easy way to switch between inline and displayed mathematics?

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