Option for parentheses around equation numbers

[jordan-melendez]

In certain journals it is common to format references to equations like Eq. (1.1) with parentheses around the equation number. Quarto supports modifying Eq. with eq-prefix, but would it be possible to either

1. Add a parameter similar to eq-prefix that allows one to customize the reference further, and/or
2. Ensure that, when compiled to PDF, \eqref gets used rather than \ref for equation references. This would require amsmath I suppose, but would automatically add parentheses and permit further customization.

Thanks!

[cderv]

Thanks for your feedback.

Currently there is no way to control that. I'll open issue about this.

For now, if you target PDF only, you could pass \eqref directly bypassing the cross ref labelling for Quarto

Example

---
format: pdf
---

Black-Scholes Eq. \eqref{eq-black-scholes} is a mathematical model that seeks to explain the behavior of financial derivatives, most commonly options:

$$
\frac{\partial \mathrm C}{ \partial \mathrm t } + \frac{1}{2}\sigma^{2} \mathrm S^{2}
\frac{\partial^{2} \mathrm C}{\partial \mathrm C^2}
  + \mathrm r \mathrm S \frac{\partial \mathrm C}{\partial \mathrm S}\ =
  \mathrm r \mathrm C 
$$ {#eq-black-scholes}

would produce

This is not ideal, as not portable in HTML (maybe portability can be added with Lua filter, but unsure).

It is just a workaround for PDF only, to show it works, but far from ideal. We'll see if we can improve this in the future

[mcanouil]

Closing in favour of #2439