Not An Introduction to knitr

Yihui Xie

2018-02-19

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.name/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] -2.12475 -0.01007 -1.53434  0.06557 -0.97349  0.17910 -1.33078
##  [8]  0.03669  0.94844  0.51564 -0.98933 -0.08986  1.29304  0.51207
## [15]  1.01773  0.18747 -0.04057 -0.71786  0.40670  0.29387
fit = lm(dist ~ speed, data = cars)
b = coef(fit)
Regression coefficients.
Estimate Std. Error t value Pr(>|t|)
(Intercept) -17.579 6.7584 -2.601 0.0123
speed 3.932 0.4155 9.464 0.0000

The fitted regression equation is \(Y=-17.5791+3.9324x\).

par(mar = c(4, 4, 1, 0.1))
plot(cars, pch = 20)
abline(fit, col = "red")
A scatterplot with a regression line.

A scatterplot with a regression line.

References

Xie, Yihui. 2015. Dynamic Documents with R and Knitr. 2nd ed. Boca Raton, Florida: Chapman; Hall/CRC. http://yihui.name/knitr/.

———. 2016. Knitr: A General-Purpose Package for Dynamic Report Generation in R. http://yihui.name/knitr/.


  1. e.g. the main manual and the graphics manual