The knitr package (Xie 2016) is an alternative tool to Sweave based on a different design with more features. This document is not an introduction, but only serves as a placeholder to guide you to the real manuals, which are available on the package website https://yihui.org/knitr/1, and remember to read the help pages of functions in this package. There is a book (Xie 2015) for this package, but it may not be useful to those who prefer digging out information on the web.
Anyway, here is a code chunk that shows you can compile vignettes with knitr as well using R 3.0.x, which supports non-Sweave vignettes:
##  -1.60955 -1.89175 -1.37949 0.58515 1.66678 0.37082 -1.19981 0.16716 ##  1.17756 -0.29093 -1.64570 2.26209 -1.79446 1.77168 0.39199 0.81839 ##  0.06991 1.26058 -1.53722 -2.00377
|Estimate||Std. Error||t value||Pr(>|t|)|
The fitted regression equation is \(Y=-17.5791+3.9324x\).
e.g. the main manual and the graphics manual↩︎