In ggplot, how to set plot title as x variable choosed when using a function

Question

I have a function that when I choose the variables it plots me a ggplot.

It works well.

gg_f <- function(df, var_x){

  ggplot(df, aes(x = {{var_x}}, mpg)) + geom_point()

}

gg_f(df = mtcars, var_x = cyl)

But when I tried to set the plot title as the var_x variable that I choose I have problems.

I tried o use glue but it didnt work:

gg_f <- function(df, var_x){
    
    ggplot(mtcars, aes(x = {{var_x}}, mpg)) + geom_point() + labs(title = glue::glue({var_x})
    
}

How can I do this?

See if this Q & A helps.

Kat
– Kat

2022-04-10 22:07:35 +00:00
Commented Apr 10, 2022 at 22:07 — Kat
– Kat, Commented Apr 10, 2022 at 22:07

Allan Cameron · Accepted Answer · 2022-04-10 22:18:05Z

3

You can use substitute(var_x)

library(ggplot2)

gg_f <- function(df, var_x){

  ggplot(df, aes(x = {{var_x}}, mpg)) + 
    geom_point() +
    labs(title = substitute(var_x))

}

gg_f(df = mtcars, var_x = cyl)

Or rlang::englue:

library(ggplot2)

gg_f <- function(df, var_x){

  ggplot(df, aes(x = {{var_x}}, mpg)) + 
    geom_point() +
    labs(title = rlang::englue("{{var_x}}"))

}

gg_f(df = mtcars, var_x = cyl)

^{Created on 2022-04-10 by the reprex package (v2.0.1)}

edited Apr 10, 2022 at 22:18

answered Apr 10, 2022 at 22:08

Allan Cameron

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7 Comments

Axeman Over a year ago

I suppose the rlang version is labs(title = as_name(enquo(var_x))).

Allan Cameron Over a year ago

@Axeman or rlang::englue

Laura Over a year ago

@AllanCameron if I want to use "outside" my function? Something like: gg_f(df = mtcars, var_x = cyl) + labs(......)

Allan Cameron Over a year ago

@Laura why wouldn't you just put labs(title = "cyl") if it was outside your function?

Allan Cameron Over a year ago

@Laura but if you put 'labs()` outside your function, you have no way to pass arguments to it other than specifying them directly.

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