Adding math symbols?

[dbleyl]

How do we include math symbols in a label?

I have tried direct plotmath syntax as well as latex2exp which outputs plotmath. In the example below, "test" renders correctly.

 geom_brace( aes(c(1,20), c(9,8.5), label="test"), labelsize=4, rotate=180, alpha=0.5, inherit.data=F)

geom_brace( aes(c(1,20), c(9,8.5), label=as.expression(bquote(mu == .(first_mu)))), labelsize=4, rotate=180, alpha=0.5, inherit.data=F)

Caused by error in compute_aesthetics():
! Aesthetics are not valid data columns.
✖ The following aesthetics are invalid:
✖ label = as.expression(bquote(mu == .(first_mu)))
ℹ Did you mistype the name of a data column or forget to add after_stat()?

I can render something like this:

geom_brace( aes(c(1,20), c(9,8.5), label="test"), labelsize=4, rotate=180, alpha=0.5, inherit.data=F) +
  geom_label(x=10.5, y=8.0, label=as.expression(bquote(mu == .(first_mu))))

Using a separate label, but positioning and the extra step seem suboptimal.

[NicolasH2]

Hi @dbleyl ,

if we are talking about unicode symbols, then this worked for me:

library(ggplot2)
library(ggbrace)

plt <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, color=Species, label=Species)) + 
  geom_point() +
  theme_classic() +
  theme(legend.position="none")

plt + geom_brace(aes(c(4,7), c(4, 4.5), label="\u03b1 \u03a9 \u00be \u026E"), inherit.data=F, labelsize=5)

you can find a list of all the unicodes in the following link. Just replace the U+ in the beginning of each unicode with \u: https://en.wikipedia.org/wiki/List_of_Unicode_characters