Not An Introduction to knitr

Yihui Xie

2023-10-26

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]  1.388985  0.503036 -0.775036  1.806629 -0.555110  0.972180 -0.052065
##  [8]  0.248322 -0.637656 -0.505279  1.075536 -0.005766  0.300989 -1.102360
## [15]  1.261733 -0.614662  0.660885  0.271355  0.714454  0.923132

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.