LaTeX 空白未出现在 RMarkdown PDF

Question

我使用rmarkdown和beamer制作教学幻灯片。 我试图在我的幻灯片中插入一个 LaTeX 方程，这个方程中有几个空格。

$Scott's \space pi = \frac{\% \space obs. \space agreements - \% \space exp. \space agreements}{1 - \% \space exp. \space agreements}$

当我在 hover 上使用我的 cursor 时，Rstudio 正确预览方程，如下面的屏幕截图所示：

但是，当我编织 PDF 时，没有出现空格，我得到了这个：

我在这里错过了什么吗？

我的 markdown header 如下：

---
title: "XXXXXXXXXXXXXXXXXXXXXXXXXXXX"
author: "XXXXXXXXXXXXXXXXXXXXXXXXX"
institute: "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
date: "XXXXXX"
output:
  beamer_presentation:
    incremental: true
    theme: "Berlin"
    colortheme: "dove"
    fonttheme: "structurebold"
    includes:
      in_header: preamble.tex
classoption: "aspectratio=169"

---

`preamble.tex' 文件如下：

\usepackage{caption}
\captionsetup[figure]{labelformat=empty}
\setbeamercolor{frametitle}{fg=white,bg=black} %section slide title
\setbeamercolor{section in foot}{fg=white, bg=black} % footsections
\setbeamercolor{part title}{fg=white, bg=black}
\setbeamertemplate{footline}
{
 \hbox{%
  \begin{beamercolorbox}[wd=.33\paperwidth,ht=2.6ex,dp=1ex,left,leftskip=2ex]{section in foot} % footsection 1
    \usebeamerfont{section in foot}\insertshortauthor
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.33\paperwidth,ht=2.6ex,dp=1ex,center]{section in foot} % footsection 2
    \usebeamerfont{section in foot} \inserttitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.34\paperwidth,ht=2.6ex,dp=1ex,right,rightskip=2ex]{section in foot} % footsection 3
    \usebeamerfont{section in foot} XXXXXXXXXXXXXXXXXXXXX
  \end{beamercolorbox}}%

  \vskip0pt%
}

\setbeamertemplate{section page}{
  \centering
  \begin{columns}
  \begin{column}{\paperwidth}
  \begin{beamercolorbox}[sep=12pt,center]{part title}
    \usebeamerfont{section title}\insertsection\par
  \end{beamercolorbox}
  \end{column}
  \end{columns}
}

Answer 1

请不要对整个单词使用数学模式，除了缺少空格外，字距都乱了！

相反，您可以使用amsmath package 中的\text{...}宏（由投影仪自动加载）

---
title: "XXXXXXXXXXXXXXXXXXXXXXXXXXXX"
author: "XXXXXXXXXXXXXXXXXXXXXXXXX"
institute: "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
date: "XXXXXX"
output:
  beamer_presentation:
    incremental: true
    theme: "Berlin"
    colortheme: "dove"
    fonttheme: "structurebold"
    includes:
      in_header: preamble.tex
classoption: "aspectratio=169"

---

- $\text{Scott's pi} = \frac{\text{\% obs. agreements} - \text{\% exp. agreements}}{1 - \text{\% exp. agreements}}$

Answer 2

您需要使用它为 RMarkdown 中的方程式添加空间： http://www.emerson.emory.edu/services/latex/latex_119.html 。 在您的情况下，您只需将\space替换为\: 。

.Rmd文件示例：

---
title: "Equation with space"
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

$$Scott's \: pi = \frac{\% \: obs. \: agreements - \% \: exp. \: agreements}{1 - \% \: exp. \: agreements}$$

输出：