CODEWITHSUNDEEP
rggplot2symbols
Ivo
Ivo

Reputation: 4200

Mathematical (set) symbol in ggplot axis label

I am trying to include mathematical signs into ggplot axis labels. Consider the following code.

library(ggplot2)
df <- data.frame(dose=c("D0.5", "D1", "D2"), len=c(4.2, 10, 29.5))
ggplot(data=df, aes(x=dose, y=len, group=1)) +
  ylab("length")+
  geom_line()+
  geom_point()

I would now like to include the range of len ("Length") in the y axis description with the notation Length ∈ [0, 10] but can't find a way to get the "element of" sign into the label.

Upvotes: 3

Views: 3293

Answers (2)

astrofunkswag
astrofunkswag

Reputation: 2698

There's a great post here that goes through the different ways, here I use expression

ggplot(data=df, aes(x=dose, y=len, group=1)) +
  ylab("length")+
  geom_line()+
  geom_point() +
  ylab(expression("Length " ~ epsilon ~ " [0, 10]"))

EDIT: Since the symbol for element of is \in, the expression code does not work since in is a built-in function. There are likely workaround, but I had to resort to using the latex2exp package

library(latex2exp)


ggplot(data=df, aes(x=dose, y=len, group=1)) +
  ylab("length")+
  geom_line()+
  geom_point() +
  ylab(TeX(sprintf("Length $\\in$ \\[0, 10\\]")))

Upvotes: 4

chemdork123
chemdork123

Reputation: 13803

For special symbols, you can reference their Unicode value via the escape character \U####. ∈ is Unicode (U+2208), so using \U2208 can be used to paste the ∈ symbol.

So:

> 'Length \U2208 [0, 10]'
[1] "Length ∈ [0, 10]"

And then you can just use ylab('Length \U2208 [0, 10]') in your plot code.

Upvotes: 0

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