Not An Introduction to knitr

Yihui Xie

2023-09-08

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] -1.304647 -1.368973 -0.073571 -0.146357 -0.632744  0.062909 -1.065006
##  [8] -0.428179  0.764904 -0.891591 -0.947785 -0.221314  0.596947  1.899294
## [15] -2.214919 -0.861626  1.074491  0.002782  0.602513  1.282320

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.