How to parse an expression to be used as a label (ggplot2)

Question

I created a function to make a ggplot2 graphic. In this function, I am passing a string as a variable that I would like to use as the y-label. To do so, I am using parse(). The following works fine:

library(ggplot2) ylab <- "xxx ~(x^2)" plot_fun <- function(ylab) { ggplot() + ylab(parse(text = ylab)) } plot_fun(ylab)

In the next example, I have an error because of the % sign.

ylab <- "xxx ~(%)" plot_fun(ylab) #> Error in parse(text = ylab): <text>:1:7: unexpected input #> 1: xxx ~(%) #> ^

Is there a better way to parse the string?

^{Created on 2020-09-17 by the reprex package (v0.3.0.9001)}

Ronak Shah · Accepted Answer · 2020-09-17 13:04:06Z

2

Put backticks in between the "%" the symbol :

ylab <- "xxx ~(`%`)" plot_fun(ylab)

answered Sep 17, 2020 at 13:04

Ronak Shah

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Comments

Duck · Accepted Answer · 2020-09-17 13:01:44Z

Try this formating your labels with expression() if necessary:

ylab <- expression(xxx ~"(%)") plot_fun(ylab)

Output:

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