CODEWITHSUNDEEP
rggplot2
T X
T X

Reputation: 613

How to type subscript/superscript in the category labels in bar plot?

I'd like to make subscript or superscript in the category labels (Fig.1) by ggplot2 in R. I found there are solutions for the axis text (e.g., this), but not for the category labels.

For example, if the bar chart has 3 categories (K_a, K_b, K_c), then there will be 3 places to change the form (not one place which is the axis text).

Fig.1

Upvotes: 1

Views: 586

Answers (1)

stefan
stefan

Reputation: 125268

This could be achieved by passing scales::parse_format to the labels argument of the scale. Using ?plotmath notation you have to recode your categories as e.g. K[b] to get a subscript "b":

df <- data.frame(
  x = paste0("K[", letters[1:3], "]"),
  y = 1:3
)

library(ggplot2)

ggplot(df, aes(x, y)) +
  geom_col() +
  scale_x_discrete(labels = scales::parse_format())

Upvotes: 2

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