Besides knitr, there is a large number of other tools for dynamic documents. Some are R packages, and others are tools in other languages such as Python and awk. We give a brief overview of these tools with comparisons to knitr in this chapter, and we especially explain the differences between Sweave and knitr for Sweave users.
The knitr package was largely motivated by Sweave (Leisch, 2002), which has been a longstanding prominent tool for dynamic documents in R, and is a part of base R (in the utils package as the Sweave() function). Sweave primarily deals with Rnw documents, although it also has a modular design that allows it to be extended to other document formats. A number of extensions based on Sweave ...
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