Using math symbols in ggplot's annotate function

Question

I am using ggplot to plot some data across 5 facets and I want to put some text that says "Delta = #" where Delta is the upper case math delta symbol and # is 1,2,3,4, or 5 based on which facet it is. Here is what I have:

annotate("text",x="baseline",y=75,label=paste(expression(Delta),"=",1:5))

My line of code works but it spells out Delta rather than giving me the Delta symbol. How can I get the math symbol?

Marco Sandri · Accepted Answer · 2017-04-26 21:58:33Z

3

Try this

df <- mtcars[2:6,]
ggplot(df, aes(mpg, disp))+
  geom_point()+
  annotate("text",df$mpg,df$disp,label=paste(("Delta * '=' *"), 1:5),
  parse=TRUE, hjust = 1.1)

edited Apr 26, 2017 at 21:58

answered Apr 26, 2017 at 21:46

Marco Sandri

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1 Comment

RustyStatistician Over a year ago

Then I lose the 1:5, i.e. on each facet I should see: Delta = 1, Delta = 2, ... etc

baptiste · Accepted Answer · 2017-04-27 00:57:26Z

1

annotate() will give you the same annotation on each facet, you should use geom_text() instead, with a suitable data.frame to provide the mapping.

library(ggplot2)
ggplot(data.frame(f=1:2, lab = sprintf("Delta == %i", 1:2))) + facet_wrap(~f) +
  geom_text(aes(label=lab), x=0, y=0, parse=TRUE)

answered Apr 27, 2017 at 0:57

baptiste

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