R knitr与\ includegraphics的PDF问题

Question

使用新的空.rmd文档，此代码有效：

![](RainbowDolphin.png)
\begin{center}
\includegraphics[width=4in]{RainbowDolphin.png}
\end{center}

但如果没有第一行，它就不会：

\begin{center}
\includegraphics[width=4in]{RainbowDolphin.png}
\end{center}

我收到错误：

! Undefined control sequence.
l.71 \includegraphics

pandoc.exe: Error producing PDF from TeX source
Error: pandoc document conversion failed with error 43
In addition: Warning message:
running command '"C:/Program Files/RStudio/bin/pandoc/pandoc" Sampling_03.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash-implicit_figures --output Sampling_03.pdf --template "C:\PROGRA~1\R\R-31~1.2\library\RMARKD~1\rmd\latex\default.tex" --highlight-style tango --latex-engine pdflatex --variable "geometry:margin=1in"' had status 43 
Execution halted

怪异。任何帮助表示赞赏！

Answer 1

这是因为乳胶模板默认不加载graphicx包。您可以通过将其添加到yaml标头手动执行此操作：

---
title: "Untitled"
header-includes: \usepackage{graphicx}
output: 
    pdf_document:
        keep_tex: true
---

Answer 2

您可以通过指定YAML元数据让Pandoc知道您在本文档中有图形：

---
graphics: yes
---