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For example, there was no syntax for tables, footnotes, math expressions, or citations. However, the original version of Markdown invented by John Gruber was often found overly simple and not suitable to write highly technical documents. The simplicity of Markdown clearly stands out among these document formats. Looking back over the five years, it seems to be fair to say that Markdown has become the most popular document format, which is what we expected. In fact, knitr supported several authoring languages from the beginning in addition to Markdown, including LaTeX, HTML, AsciiDoc, reStructuredText, and Textile. The idea was to embed code chunks (of R or other languages) in Markdown documents. The document format “R Markdown” was first introduced in the knitr package ( Xie 2015, 2022b) in early 2012. The online version of this book is free to read here (thanks to Chapman & Hall/CRC), and licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Note: This book has been published by Chapman & Hall/CRC.