How to add latex in ggplot axis text?

Question

Goal

Put latex in x-axis text in ggplot2.

Data

Following is my sample data:

df <- structure(list(LV_type = c("LV Type: Car", "LV Type: Car", "LV Type: Car"
), reac_to_stpd_scn = c("Moving LV", "Moving LV", "Moving LV"
), Variable = c("AIC_AV_W_base", "AIC_AV_H_base", "AIC_TI_base"
), AIC = c(95.9878231314661, NA, 97.0658161329315), var_symbols = c("$\\dot{\\theta_{W}}$", 
"$\\dot{\\theta_{H}}$", "$\\tau^{-1}$")), row.names = c(NA, -3L
), class = c("tbl_df", "tbl", "data.frame"))

Attempts

library(ggplot2)
library(latex2exp)

Following obviously does not work:

ggplot(df) +
  geom_point(aes(var_symbols, AIC, color = Variable))

I also tried following:

ggplot(df) +
  geom_point(aes(Variable, AIC, color = Variable)) +
  scale_x_discrete(labels = c("AIC_AV_W_base" = expression("$\\dot{\\theta_{W}}$"),
                              "AIC_AV_H_base"   = expression("$\\dot{\\theta_{H}}$"),
                              "AIC_TI_base" = expression("$\\tau^{-1}$")))

I also tried to replace expression with latex2exp::TeX above, but that also did not work. Please suggest how can I put latex in axis labels.

iroha · Accepted Answer · 2021-07-26 00:46:46Z

2

As you have the expressions as a variable in your data frame, you can use them as the x aesthetic and pass the TeX() function to the label argument in scale_x_discrete().

library(latex2exp)
library(ggplot2)

 ggplot(df) +
  geom_point(aes(var_symbols, AIC, color = Variable)) +
  scale_x_discrete(labels = TeX)

You can do the same thing with the legend if needed using scale_color_discrete().

answered Jul 26, 2021 at 0:46

iroha

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