CODEWITHSUNDEEP
rmarkdownknitrr-markdown
Stéphane Laurent
Stéphane Laurent

Reputation: 84719

How to display verbatim inline r code with backticks using Rmarkdown?

By doubling the backticks in Markdown, it is easy to render some text in code style including the backticks, such as: `r 2+2`. But how to do that with RMarkdown ? By the same way we can display `t 2+2`, but replacing t with r executes the R code 2+2.

The only way I have found so far is:

<p><code  class="r">`</code><code class="r">r 2+2`</code></p>

Not very convenient. Maybe I should define a new css for doing that more conveniently ?

Upvotes: 39

Views: 13202

Answers (5)

Miguel Alvarez
Miguel Alvarez

Reputation: 323

The solution of Yihui Xie was not displaying the enclosing quotations in the inserted code when rendering a README.md file for a Github repository. In that case I used html code:

<code>&grave;r foo(x)&grave;</code>

Which displays `r foo(x)` inline.

Upvotes: 5

adunaic
adunaic

Reputation: 172

To anyone looking at this now, you may want to check out the more recent solution here: embed Rmarkdown without knitr evaluation

Essentially you can do:

Some R code inline : `r knitr::inline_expr("2+2")`

I'm guessing that the functionality describe above has been added to knitr directly but it saves us defining the function ourselves.

Upvotes: 5

Yihui Xie
Yihui Xie

Reputation: 30194

Here is a trick that I use. First, note \x60 is `:

> cat('\x60', '\n')
`

Then you write

`r '\x60r foo+bar\x60'`

which will give you `r foo+bar` in the markdown output, but that will become r foo+bar in the HTML output, so you need to protect the backticks in markdown, using two (or more) backticks. Then you end up with this hairball:

`` `r '\x60r foo+bar\x60'` ``

Your own solution is good, but I'd just define

rinline <- function(code) {
  sprintf('``` `r %s` ```', code)
}

Also see this post for another trick.

Upvotes: 39

aquaraga
aquaraga

Reputation: 4168

I just learnt about the results='asis' option.
So, yet another way; for fun and learning :-)

```{r, results='asis', echo=FALSE}
cat("`` `r 2+2` ``")
```

Upvotes: 4

St&#233;phane Laurent
St&#233;phane Laurent

Reputation: 84719

Here is a satisfactory finding. First define the function 

rinline <- function(code){
  html <- '<code  class="r">``` `r CODE` ```</code>'
  sub("CODE", code, html)
}

in an invisible chunk. Then you can show `r 2+2` by typing:

Some R code inline : `r rinline("2+2")` - nice

Upvotes: 4

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