Not An Introduction to knitr

Yihui Xie

2023-01-19

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]  0.61769 -0.80560  0.33799  0.82468  0.27238 -0.01469 -0.53509 -0.28496
##  [9] -1.00412 -0.92200 -0.33577 -0.16676 -0.40667  0.31883  0.73298  1.09309
## [17]  0.71330 -1.10522  0.70505  1.38676

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.