TikZ in R Markdown

Question

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 t

Answer 1

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: