R Markdown is a good tool for document authoring. It can use LaTeX statement in R Markdown directory. But when I try to insert a TikZ picture, I am lost about how to add preamble \usepackage{tikz} in it, so compile will fail.
Example code:
---
title: "R Markdown with tikz picture"
author: "Me"
date: "January 10, 2015"
output: beamer_presentation
---
## TikZ picture
- Here is a TikZ picutre
\begin{tikzpicture}
\draw (0,0) circle (2cm);
\end{tikzpicture}
Since actually it will generate a LaTeX document, so it's fine to just add it in LaTeX and then compile it to PDF but I wish I can just do it in R Markdown, then click the "Knit to PDF" button to generate PDF document directly.
Answer
This is a example about how to use tikz graph in R Markdown within R Studio
---
title: "Hello World"
author: "Me"
date: "February 17, 2015"
output:
pdf_document: default
header-includes:
- \usepackage{tikz}
- \usepackage{pgfplots}
---
## TikZ picture
- Here is a TikZ picutre
\begin{tikzpicture}
\draw (0,0) circle (2cm);
\end{tikzpicture}
- Here is another TikZ picutre
\begin{tikzpicture}
\begin{axis}[xmax=9,ymax=9, samples=50]
\addplot[blue, ultra thick] (x,x*x);
\addplot[red, ultra thick] (x*x,x);
\end{axis}
\end{tikzpicture}
Output:
