[R] ggplot - start axis label with superscript

[Tom Walker]

Dear help,

I’m stuck trying to begin an axis label in ggplot with a superscript. While I’m fine using expression to insert them in between normal text in an axis label, this doesn’t appear to work at the start of an expression. For example:

mydata <- data.frame(x = 1:10, y = 10:1)

# this works:
ggplot(mydata) +
  aes(x = x, y = y) +
  geom_line() +
  ylab(expression(paste(Incorrect^{14}, "C", sep = "")))

# this doesn’t work (and is what I would like to be able to do):
ggplot(mydata) +
  aes(x = x, y = y) +
  geom_line() +
  ylab(expression(paste(^{14}, "C", sep = "")))

Any help on this issue would be much appreciated! 

Many thanks,

Tom