Superscript and subscript axis labels in ggplot2 [duplicate]

问题

This question already has an answer here:

• Subscript letters in ggplot axis label 2 answers

I need an axis label in ggplot2 which reads "Assimilation (μmol CO2 m-2 s-1)" with the 2 of CO2 as subscript and the -2 and -1 as superscript. Thanks.

回答1:

You could try

library(ggplot2)
qplot(uptake, data = CO2) +
   xlab(bquote('Assimilation ('*mu~ 'mol' ~CO[2]~ m^-2~s^-1*')'))

来源：https://stackoverflow.com/questions/27445452/superscript-and-subscript-axis-labels-in-ggplot2