[R] Symbols in pdf output of flextable() via R markdown

[Duncan Murdoch]

On 2026-10-06 7:57 a.m., Paul Sherliker via R-help wrote:
> I am trying to produce some tables in flextable(), sending the results to .pdf.  The target format is not negotiable, and because I must produce them at volume, I can't have any human intervention after the code is run; flextable() might be negotiable, but I would be loath to try to learn something else.  (both R markdown and flextable() are new to me)
> 
> My problem is a difficulty with a single character that my tables must contain - a chi in the footer.  (Again, not negotiable - my bosses are not going to be persuadable.)
> 
> I have tinytex installed to allow the use of .pdf.
> 
> Sample R markdown code showing the problem (for me!) follows (the body of the table is irrelevant):
> 
> ________________________________________
> title: "Example"
> author: "Paul Sherliker"
> date: "2026-10-06"
> output: pdf_document
> ________________________________________
> ```{r setup, include=FALSE}
> knitr::opts_chunk$set(echo = TRUE)
> ```
> R Markdown
> ```{r cars}
> require(flextable)
> ft <- flextable(head(cars))
> ft <- add_footer_lines(ft, value=as_paragraph(
> as_chunk(paste0("* The % change in log RR is displayed only if the log ",
> "RR to be changed differs by >3.3 SE from zero (")),
> as_chunk("c", props = fp_text_default(font.family = "Symbol")),
> as_sup("2"),
> as_chunk(" of 10.89; p<0.001).")))
> ft
> ```
> 
> What I get does not have the chi character that I would expect, but instead a 'c'.  Is there some way to get the chi without adding too much extra complexity, please?
> 
>   Thank you for your time and, I hope, for your help.
On my Mac, it works to insert the Unicode symbol 1D712 which is 
"MATHEMATICAL ITALIC SMALL CHI".  You do that by replacing the 
as_chunk("c", ...) with as_chunk("\U1D712").

Duncan Murdoch