xaringan：使用宏添加自定义Latex文件

Question

例如，是否可以导入Latex宏文件

\newcommand{\Xcal}{\mathcal{X}

这样我就可以在$...$之间使用它作为$\Xcal$？

Answer 1

是的，这似乎有效：

---
title: "Presentation Ninja"
subtitle: "⚔<br/>with xaringan"
author: "Yihui Xie"
date: "2016/12/12 (updated: `r Sys.Date()`)"
output:
  xaringan::moon_reader:
    lib_dir: libs
    nature:
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
---

<script type="text/x-mathjax-config">
MathJax.Hub.Config({
  TeX: {
    Macros: {
      Xcal: "{\\mathcal{X}}",
      water: "{H_2O}"
    }
  }
});
</script>

$\water$    
$\Xcal$

在脚本标记上使用type=text/x-mathjax-config非常重要，因此mathjax会找到该块。有关在MathJax中定义宏的详细信息，请参阅here。

另一种方法是使用before_body YAML选项包含定义：

---
title: "Presentation Ninja"
subtitle: "⚔<br/>with xaringan"
author: "Yihui Xie"
date: "2016/12/12 (updated: `r Sys.Date()`)"
output:
  xaringan::moon_reader:
    lib_dir: libs
    nature:
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
    includes:
      before_body: local.html
---

Answer 2

MathJax允许您定义宏。在Xaringan中，您只需将宏放入双美元符号即可。

---
title: "Presentation Ninja"
subtitle: "⚔<br/>with xaringan"
author: "Yihui Xie"
date: "2016/12/12 (updated: `r Sys.Date()`)"
output:
  xaringan::moon_reader:
    lib_dir: libs
    nature:
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
---

$$\newcommand{\Xcal}{\mathcal{X}}$$

# Math Macros

You can define your own macros by putting them in double dollars signs.

```
$$\newcommand{\Xcal}{\mathcal{X}}$$
```

This symbol $\Xcal$ is a calligraphic X.