knitr

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The R package knitr is a general-purpose literate programming engine, with lightweight API's designed to give users full control of the output without heavy coding work. It combines many features into one package with slight tweaks motivated from my everyday use of Sweave. See the package homepage for details and examples. See FAQ's for a list of frequently asked questions (including where to ask questions).

Installation

You can install the stable version on CRAN:

install.packages('knitr', dependencies = TRUE)

You can also install the development version from RForge, which provides daily build of knitr:

# update all existing packages first
update.packages(ask = FALSE, repos = 'http://cran.rstudio.org')
install.packages('knitr', repos = c('http://rforge.net', 'http://cran.rstudio.org'),
                 type = 'source')

Or use devtools to install the development version from Github:

devtools::install_github('yihui/knitr', build_vignettes = TRUE)

Motivation

While Sweave and related add-on packages like cacheSweave and pgfSweave are fairly good engines for literate programming in R, but I often feel my hands are tied, for example:

The package knitr was designed to give the user access to every part of the process of dealing with a literate programming document, so there is no need to hack at any core components if you want more freedom. I have gone through the source code of pgfSweave and cacheSweave for a couple of times, and I often feel uncomfortable with the large amount of code copied from official R, especially when R has a new version released (I will begin to worry if the add-on packages are still up-to-date with the official Sweave).

Usage

library(knitr)
?knit
knit(input)

The book Dynamic Documents with R and knitr

If options are not explicitly specified, knitr will try to guess reasonable default settings. A few manuals are available such as the main manual, and the graphics manual. For a more organized reference, see the knitr book.

License

This package is free and open source software, licensed under GPL.