Is it possible to create a question based for r-exams, based on Venn diagrams code from TikZ?

Question

I'm trying to create a question in RMarkdown, using r-exams, based on the Venn diagrams package from TikZ https://www.ctan.org/pkg/venndiagram. I can't get it to work properly.

Here part of my code:

grafika01<-'
    \\begin{tikzpicture}
        \\begin{venndiagram3sets}
    \\fillNotABC
\\end{venndiagram3sets}
\\end{tikzpicture}

'

What's more,

```{r grafica01, echo = FALSE, results = "asis"}
include_tikz(grafika01, name = "grafiko1", markup = "markdown",format = typ,library = 
c("arrows"),packages = 
c("booktabs","tikz","pgfplots","venndiagram","calc","babel","xkeyval","etoolbox"),
width = "7cm")
```

Thank you.

Answer 1

(Note: This is really more about combining {tikz} and {venndiagram} and does not have much to do with R/exams.)

If you want to put a {venndiagram3sets} into a {tikzpicture} then you need to include it in a \node{...};:

grafika01 <- '
\\begin{tikzpicture}
\\node{
\\begin{venndiagram3sets}
\\fillNotABC
\\end{venndiagram3sets}
};
\\end{tikzpicture}
'

And this LaTeX code can then be compiled successfully, e.g., using include_tikz():

include_tikz(grafika01, name = "grafiko1", markup = "markdown", format = typ,
  packages = "venndiagram", width = "7cm")