Not An Introduction to knitr

Yihui Xie

2022-08-24

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] -0.25115 -1.40349 -0.88135  0.75414 -1.53918 -0.63499  0.20690 -0.70139
##  [9]  2.60077  1.06142  0.06727 -0.32251  1.21175 -0.27918 -0.76394 -2.41183
## [17]  0.05452  0.01655  0.27846 -0.15727

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.