4.10 Numbered figure captions

4.10 Numbered figure captions

We can use bookdown (Xie 2020c) output formats to add figure numbers to their captions. Below is an example:

---
output: bookdown::html_document2
---
``` ```
```{r cars, fig.cap = "An amazing plot"}
plot(cars)

plot(mpg ~ hp, mtcars)

Section [4.7](/read/rmarkdown-cookbook-1.0-en/d031#cross-ref) demonstrates how this works for other elements such as tables and equations, and how to cross-reference the numbered elements within the text. Besides `html_document2`, there are several other similar functions for other output formats, such as `pdf_document2` and `word_document2`.

You can add this feature to R Markdown output formats outside **bookdown** , too. The key is to use those formats as the “base formats” of **bookdown** output formats. For example, to number and cross-reference figures in the `rticles::jss_article` format, you can use:

output: bookdown::pdf_book: base_format: rticles::jss_article ```

Please read the help pages of the bookdown output format functions to see if they have the base_format argument (e.g., ?bookdown::html_document2).

References

———. 2020c. Bookdown: Authoring Books and Technical Documents with r Markdown. https://github.com/rstudio/bookdown.