Author: Yihui Xie
Date: 2017-05-17

# Not An Introduction to knitr

#### Yihui Xie

#### 2017-05-17

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 http://yihui.name/knitr1, 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]  1.14241 -0.06596 -0.04932 -0.01794 -0.32703  1.13619 -0.49862
    ##  [8]  0.69627 -1.46082 -0.15826 -1.18668  0.90296 -0.88339 -0.88122
    ## [15]  0.68114 -0.09012  0.65127  0.54746  0.01149 -0.50950

    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↩