font size in output of an R code block

[christophhofer]

With which code option can the font size be changed (R Code Block). In R Markdown there is the argument size for it. Is there something comparable in Quarto.

[mcanouil]

With the attr-* or class-* YAML options (https://quarto.org/docs/reference/cells/cells-knitr.html)

---
format: html
---

```{r}
#| attr-source: "style='font-size: 5em'"
#| attr-output: "style='font-size: 0.2em'"
1 + 1
```

[mcanouil]

You mean you use Sweave?
Or raw LaTeX?

The size option did not work for rmarkdown.

To note, depending on what your output is, you could print raw LaTeX in the code cell.
Also, you could make a feature request for a source/output size.

[christophhofer]

I use R Markdown (Rmd file) and partly raw LaTex in it. If I control the font size via raw LaTex (e.g. \tiny) this also has an influence on the R code block.

I just didn't realize that the size parameter in the R chunk doesn't work. I have I have read over the ending Rnw.

[mcanouil]

Unless I am missing something (_i.e., I am not a heavy user of PDF formats with `rmarkdown' or Quarto), I think the solution would be a Lua filter to tweak only the output of a code cell.
I'll try later some ideas.

Could you unmark the answer, since for now, there is no proper answer for PDF?

[mcanouil]

@cderv I am pinging you since you surely have more experienced with knitr/rmarkdown engine to customise code chunk/cell output.
I did not find anything in Quarto's documentation (https://quarto.org/docs/reference/formats/pdf.html).
Are you aware of some kind of equivalent to attr-* or class-* options but for LaTeX/PDF to, in this case, modify the font size?

[cderv]

I just didn't realize that the size parameter in the R chunk doesn't work. I have I have read over the ending Rnw

Yes this is an option that will work for Rnw not Rmd document. There should not be mention of it in R Markdown documentation.
it is used in knitr with specific hooks using for LaTeX generation using Rnw or Rtex document I believe.

With which code option can the font size be changed (R Code Block). In R Markdown there is the argument size for it. Is there something comparable in Quarto.

Regarding the main question, I don't think we have a configuration to change font size for code that is common to all formats.

With all HTML output, theming system could be use to change the font of code block I believe using CSS.
And a custom solution for LaTeX would need to be found.
Pandoc (and this quarto) has font options for LaTeX that is suppose to help tweak such things (https://quarto.org/docs/reference/formats/pdf.html#fonts) . Otherwise, I think we use something like \usepackage[scale=.8]{sourcecodepro} in our preamble of some books, so that the space used for code chunk (monofont) is smaller.

If we want something on per chunk only, I don't think we have that, and if Pandoc is allowing such tweaks (it is creating a specific Verbatim environment that I don't know if it has options).

Hope it helps.