Not An Introduction to knitr

Yihui Xie

2022-04-26

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] -0.432492 -1.934594  0.090109 -0.537050  0.349098  0.156540 -0.202615
##  [8] -2.024916 -0.940910  0.602132  0.624322 -0.422067 -0.706236 -1.168691
## [15] -0.481862  0.272402 -0.528331 -0.497320 -0.008859 -1.556787

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.