CODEWITHSUNDEEP
r-markdownpandocbookdown
fulem
fulem

Reputation: 85

Bookdown - Reference tag from another math environment broken

It seems i can't reference equations, lemas, etc when inside math.

In the following example the tag eq:test cant be referenced inside the align, but it works fine outside.

--- 
title: "Test"
site: bookdown::bookdown_site
documentclass: article
---

If

\begin{equation} 
  A = B
  (\#eq:test)
\end{equation}

then 

\begin{align*} 
     A \ &= B   &&, \text{ by } \@ref(eq:test)   \\  % this will not work
         &= C
\end{align*}

But here \@ref(eq:test) it works.

I want to know if this is currently not possible or i'm missing some special notation to make it work.

Upvotes: 1

Views: 183

Answers (1)

Shafee
Shafee

Reputation: 20087

Try with latex command \label{} and \eqref{}.

\label, \eqref works smoothly for pdf output as expected. For html output, we need to configure the Tex component of mathjax through the tex block as instructed here.

--- 
title: "Test"
output:
  bookdown::pdf_document2:
    documentclass: article
  bookdown::html_document2: default
---

```{=html}
<script>
  MathJax = {
    tex: {
      tags: 'all'
    }
  };
  </script>
  <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js"></script>
  
```

If

\begin{equation} 
  A = B \label{test-eq1}
\end{equation}

then 

\begin{align*} 
     A \ &= B   &&, \text{ by } \eqref{test-eq1} \\
         &= C
\end{align*}

But here \eqref{test-eq1} it works.

pdf output

pdf output

html output

html output

Upvotes: 1

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