如何使用 RMarkdown 在 Fig.caption 中使用希腊字母？

Question

当我尝试在RStudio中使用RMarkdown编织 pdf 时，此代码会产生错误。

如何在Fig.caption中写一个希腊字母，例如$\beta$？

---
title: "Untitled"
author: "SB"
date: "Thursday, January 29, 2015"
output: 
  pdf_document:
  fig_caption: yes
---


```{r var, echo=FALSE, fig.cap="Cars variation rate between year $t$ and $t-1$ for $0 < \beta < 1$"}
plot(cars)
```

Answer 1

在 R 中，字符串内的所有反斜杠都需要加倍。"\\"变成\.

尝试这个：

---
title: "Untitled"
author: "SB"
date: "Thursday, January 29, 2015"
output: 
  pdf_document:
    fig_caption: yes
---

```{r var, echo=FALSE, fig.cap="Cars variation rate between year $t$ and $t-1$ for $0 < \\beta < 1$"}
plot(cars)
```