Not An Introduction to knitr

Yihui Xie

2023-05-23

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:

options(digits = 4)
rnorm(20)

##  [1] -1.60955 -1.89175 -1.37949  0.58515  1.66678  0.37082 -1.19981  0.16716
##  [9]  1.17756 -0.29093 -1.64570  2.26209 -1.79446  1.77168  0.39199  0.81839
## [17]  0.06991  1.26058 -1.53722 -2.00377

fit = lm(dist ~ speed, data = cars)
b = coef(fit)

The fitted regression equation is \(Y=-17.5791+3.9324x\).

par(mar=c(4, 4, 1, .1))
plot(cars, pch = 20)
abline(fit, col = 'red')

A scatterplot with a regression line.