Not An Introduction to knitr

Yihui Xie

2022-11-16

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]  1.09408 -1.84512 -1.66938 -1.28898  0.67068  2.54885  1.31644  0.34171
##  [9] -1.28452 -0.55621 -1.04866 -0.43819  0.44034  0.32769  0.00892  0.41928
## [17]  1.54341  0.51422  1.65724 -0.24455

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.