# Not An Introduction to knitr

#### Yihui Xie

#### 2019-03-08

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.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] -0.27971  0.20226  0.43451  1.04519 -1.15509 -0.09407  0.04128
    ##  [8]  1.14778  0.70944  0.25841  2.17469  1.23306 -1.04496  0.30611
    ## [15] -1.47991 -1.28170 -1.11212  1.00938  1.64041  0.81715

    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.

## 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↩