Not An Introduction to knitr

Yihui Xie

2020-06-22

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] -0.19169  0.67134  0.22346  0.71502 -0.11204  0.75763  1.46664 -0.50364
##  [9] -0.09981 -0.25703  0.49641 -0.72781 -1.75855 -1.34796 -0.06976  0.62396
## [17]  0.13471  1.02056 -2.16856 -1.73060

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.