Underline the header using forestplot

Question

I'm trying to underline my headers for my columns of my forestplot, which I've created with the forestplot() function from the library(forestplot) package.

this is a excerpt of the settings i already have with the plot. I've changed the header fontface from its default "bold" to "plain" in the last line of code below, in the 'summary=' object. Unfortunately gpar(fontface="") doesn't seem to have an "underline" option.

library(forestplot)
base_data |>
 forestplot(labeltext = c(text, results),
            zero=1,
  col = fpColors(zero="black"),
            txt_gp = fpTxtGp(label = gpar(fontfamily = "Arial"),
                             ticks=gpar(cex=1),
                             xlab=gpar(cex=1),
                             summary=gpar(fontface="plain")))

Anyone have any suggestions?

It's easier to help you if you include a simple [reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) with sample input and desired output that can be used to test and verify possible solutions. — MrFlick, Jul 17 '23 at 19:40
@MrFlick I am assuming the data is from the package repo: https://github.com/gforge/forestplot/blob/master/vignettes/forestplot.Rmd#L65C1-L72C92 — zx8754, Jul 17 '23 at 19:42
@zx8754 There are no `text` or `results` columns in the data from that vignette. — MrFlick, Jul 17 '23 at 19:44
@MrFlick correct, just noticed. Still could be used as example, the question is about the header. — zx8754, Jul 17 '23 at 19:50

score 1 · Accepted Answer · answered Jul 17 '23 at 19:57

We can use expression with underline, in this example I am underlining "Study":

library(forestplot)

# example data is from the package's vignette:
# https://github.com/gforge/forestplot/blob/master/vignettes/forestplot.Rmd#L65

base_data |>
  forestplot(labeltext = c(study, deaths_steroid, deaths_placebo, OR),
             clip = c(0.1, 2.5),
             xlog = TRUE) |>
  fp_add_header(study = c("", expression(underline(Study))),
                deaths_steroid = c("Deaths", "(steroid)"),
                deaths_placebo = c("Deaths", "(placebo)"),
                OR = c("", "OR"))

perfect. thank you! just to add for anyone who might need this too: if using a phrase rather than one word you need to put the phrase in ` ` , ie. expression(underline( ` Study Results ` )) — dkong, Jul 17 '23 at 20:06

Underline the header using forestplot

1 Answers1