I am writing a report with Rmd in RStudio via knitr package.

I want to write a indicator variable symbol in the report, like How do you get \mathbb{1} to work (characteristic function of a set)?.

The line \usepackage{bbm} should be included according to the answer.

I tried first

y_{ij} = b_{ij} + \beta_{0} + \beta_{1}

But the program cannot interpret \usepackage{bbm}.

  • It would be great to see a full code in your post. My general advice is that \usepackage{bbm} belongs to the preamble of the document, not to the document body. Meaning, move this part above \begin{document}. – Malipivo Apr 16 '14 at 2:53
  • 6
    @Malipivo This is a question about R Markdown, and I believe it belongs to StackOverflow instead of TeX.SE. – Yihui Xie Apr 17 '14 at 18:52

I think this is the easiest option!

title: "Title"
author: "Me"
   - \usepackage{bbm}

(Edited to have three, instead of four, hyphens to open and close the YAML front-matter)

  • 1
    This worked more readily than the other answer, which could not find the path to tex. – deepwinter Feb 9 '15 at 15:39

As per this page on the R Markdown website, you can add whatever you want to the preamble via the in-header option in the YAML header; e.g.,

title: "Titre"
date: Fecha
            in_header: mystyles.sty

In mystyles.sty, located in the same directory as the .Rmd, you could have a whole list of additional things to add to the preamble of document, e.g.:


Etc. The contents of mystyles.sty are then pasted into the LaTeX preamble; check out the default LaTeX template used here to see where precisely in the preamble they are included.

As a minimal example I tested an Rmd document with the header from above including the .sty from above and having the following in the body of the document:

$$ y_{ij} = b_{ij} + \beta_{0} + \beta_{1} $$

Test test $\mathbb{1}$ test.

As of rmarkdown version 1.4 it has been possible to use the extra_dependencies parameter to list a character vector of LaTeX packages. This is useful if you need to load multiple packages:

title: "Untitled"
    extra_dependencies: ["bbm", "threeparttable"]

If you need to specify options when loading the package, you can add a second-level to the list and provide the options as a list:

      hyperref: ["unicode=true", "breaklinks=true"]
      lmodern: null

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