# Not An Introduction to knitr

#### Yihui Xie

#### 2020-02-06

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/, 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] -0.33060 -0.39099 0.93292 0.59460 -0.57211 0.52964 -2.21362 1.02436
## [9] -0.21179 -0.22230 -2.37931 -0.40977 -0.36230 0.04407 -0.49126 -0.93393
## [17] 1.10141 1.25615 -0.07600 0.92807
```

```
fit = lm(dist ~ speed, data = cars)
b = coef(fit)
```

Regression coefficients.
(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, .1))
plot(cars, pch = 20)
abline(fit, col = 'red')
```

## References

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