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I want to annotate a ggplot with the phrase "Large fish ≥ 45cm" but can't seem to achieve it. I tried the following example but it produces an "=". Also adding "45" throws up an error.

ggplot(mtcars, aes(mpg, disp))+
geom_point()+
annotate("text",25,400, label=("Fish*~symbol('\u2265')*~cm"), parse=TRUE, hjust=0)
jimken
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2 Answers2

5

How about this:

ggplot(mtcars, aes(mpg, disp))+
    geom_point()+
    annotate("text",25,400, label=("'Large fish' >= 45 ~ 'cm'"), parse=TRUE, hjust=0)
mt1022
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1

A different solution is based on the latex2exp package (an R package that parses and converts LaTeX math formulas to R’s plotmath expressions):

library(latex2exp)
ggplot(mtcars, aes(mpg, disp))+
 geom_point()+
 annotate("text",25,400,
          label=TeX("Fish $\\geq$ 45 cm", output="character"),
          hjust=0, parse=TRUE)
Marco Sandri
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  • ggplot returns exactly $\geq$ and in the pdf from Latex it's also $\geq$. How to make it to display ≥? – Laura Nov 25 '19 at 15:08
  • I specifically want to write "≥" symbol in a label of the legend. – Laura Nov 25 '19 at 16:44
  • @Laura You can use the solution proposed here https://stackoverflow.com/questions/19507742/using-expressionpaste-to-insert-math-notation-into-a-legend – Marco Sandri Nov 25 '19 at 17:25