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Based on a post from Ken Kleinman.

[//]: # "Somme comments"
[//]: # (Some comments)

Common mistakes

• Two chunks with the same name will cause a big error message
• Bullet list need to have an empty line before to be recognized it can also be forced with html code <li>item1</li> or \list{\item \item}

CSS styling in HTML

  # Centering knitr::kable() on the page
  <style type="text/css">
    .table {
      margin-left:30%; 
      width:40%;
    }
  </style>

YAML template settings for \LaTeX

---
title: 'My Report'
author: 'Benjamin Guiastrennec'
date: "28 March, 2016"
mainfont: Arial
sansfont: Arial
monofont: Courier
output:
  pdf_document:
  latex_engine: xelatex
number_sections: yes
toc: yes
---

Change knitr options

# Change default to eval = FALSE
knitr::opts_chunk$set(eval = FALSE)

# Enable soft wrap in latex
knitr::opts_chunk$set(tidy = TRUE, tidy.opts = list(width.cutoff = 60))

Note : see also opt_knit$set() for changing global knitr options.

Extract Rmarkdown R code

knitr::purl('file.Rmd', documentation = 2)