How to add math/subscript in geom_bracket in ggplot2?

Question

I there!

I want to include a label with subscript in geom_bracket in ggplot2. I tried in different ways, but no one worked (attempts in the comments):

library(ggplot2)
ggplot(data = mtcars, aes(x = vs, y = disp)) +
  geom_point() +
  geom_bracket(xmin = .25, xmax = .75, y.position = 250
               ,label = paste0("p_b<", format(0.06, nsmall = 3))
               # ,label = paste0(expression(p[b]), "<", format(0.06, nsmall = 3))
               # ,label = TeX(paste0("p_b<", format(0.06, nsmall = 3)))
               )

What I got:

Subscript does not work.

Thanks

score 5 · Accepted Answer · answered Oct 23 '20 at 12:45

5

geom_bracket() (which is from ggpubr not ggplot2) uses an argument to specify whether the label is an expression or text, so you can do:

library(ggplot2)
library(ggpubr)

ggplot(data = mtcars, aes(x = vs, y = disp)) +
  geom_point() +
  geom_bracket(xmin = .25, xmax = .75, y.position = 250,
               label = "p[b] < 0.06", type = "expression")

answered Oct 23 '20 at 12:45

Ritchie Sacramento

29,890
4
48
56

1

Tks Brow! You saved my day! I forgot that! I spent too much time on it.. – Guilherme Parreira Oct 23 '20 at 12:47
To add more info to the answer: In order to keep the formatting (whit trailing zeros) I had to do: `label = paste0("p[b] < ", deparse(format(0.06, nsmall = 3)))` – Guilherme Parreira Oct 23 '20 at 13:45

How to add math/subscript in geom_bracket in ggplot2?

1 Answers1