Adding prime symbol (') to ggplot2 axis label using expression()-CodePudding

I have the following code snippet that should (once complete) plot u_prime and v_prime on the log2(x 1) scale using expression:

p <- ggplot(df_uv_prime, aes(x = u_prime, y = v_prime))   geom_point(colour = "blue")  
            labs(x = expression(log[2](u^{...}   1)), y = expression(log[2](v^{...}   1)))  
            xlim(0, 1)  
            ylim(0, 1)

However adding ' in place of ... doesn't work, as R expects a closing '.

Is there a base R solution without having to resort to any packages?

CodePudding user response：

Based on your description of the desired outcome, one option is to enclose the single quote or backtick (not sure which one you're using) in double quotes and add 'connectors' (*) or 'spaces' (~) to either side, e.g. backtick with space on x axis, single quote with connector on y axis:

library(ggplot2)

ggplot(mtcars, aes(x = hp, y = disp))  
  geom_point(colour = "blue")  
  labs(x = expression(log[2](u*"`"~   1)),
       y = expression(log[2](v*"'"*   1)))

^{Created on 2022-11-28 with reprex v2.0.2}