How to evaluate Latex and a variable in a ggplot title?

Question

I often want to display both Latex and the underlying value of a variable in a ggplot title, but my existing methods seem to only work for one or the other.

library(tidyverse)
library(glue)
library(latex2exp)

MY_VARIABLE <- 1000
ggplot(mtcars, aes(x=wt, y=mpg)) +
    geom_point() + 
    labs(title = TeX(r'(Can I use $\LaTeX$ with MY_VARIABLE)')))

MY_VARIABLE <- 1000
ggplot(mtcars, aes(x=wt, y=mpg)) +
    geom_point() + 
    labs(title = glue('Can I use \\LaTeX with {MY_VARIABLE}'))

Quinten · Accepted Answer · 2022-08-16 17:56:53Z

2

Another option using paste0 with TeX:

library(tidyverse)
library(latex2exp)
MY_VARIABLE <- 1000
ggplot(mtcars, aes(x=wt, y=mpg)) +
  geom_point() + 
  labs(title = TeX(paste0('Can I use \\LaTeX with', MY_VARIABLE)))

^{Created on 2022-08-16 by the reprex package (v2.0.1)}

answered Aug 16, 2022 at 17:56

Quinten

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Comments

Allan Cameron · Accepted Answer · 2022-08-16 17:52:17Z

2

Just pass the output of glue to TeX:

library(tidyverse)
library(glue)
library(latex2exp)

MY_VARIABLE <- 1000
ggplot(mtcars, aes(x=wt, y=mpg)) +
    geom_point() + 
    labs(title = TeX(glue('Can I use \\LaTeX with {MY_VARIABLE}')))

answered Aug 16, 2022 at 17:52

Allan Cameron

178k7 gold badges71 silver badges118 bronze badges

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