Using ggplot in a function

Question

I am trying to create a function in r using ggplot. This is my code so far:

breakchart<-function(df,x,y) {
  ggplot(df,aes( {{x}} ,{{y}}))  + geom_point() +
    ylim(-20,20) + xlim(-20,20) + 
    geom_hline(yintercept = 0) +
    geom_vline(xintercept = 0) + 
    ggtitle(" Break Chart")

This has worked. However, I want to add a color aesthetic to my graphing function. EXAMPLE: ggplot(df,aes( x , y, color = ??)) + geom_point()

I am not sure how to do this without causing an error. Does anybody have an idea how to do this? Thanks

Does it not work if you just use the same approach as for x and y? ie, aes({{ x }}, {{ y }}, color = {{ color }})? What have you tried, and what error are you seeing? — zephryl
– zephryl, Commented Mar 10, 2022 at 3:37
Yes, it worked- had to adjust something small in the code when I was defining the function. Thanks — natguy8
– natguy8, Commented Mar 15, 2022 at 0:29

Matt Cowgill · Accepted Answer · 2022-03-10 03:52:12Z

1

The approach you've already taken works for me.

library(ggplot2)

breakchart<-function(df, 
                     x,
                     y, 
                     colour, 
                     ylim = c(-20, 20), 
                     xlim = c(-20, 20),
                     title = "Break chart") {
  ggplot(df,
         aes(x = {{x}},
             y = {{y}},
             colour = {{colour}})
         )  + 
    geom_point() +
    ylim(ylim) + xlim(xlim) + 
    geom_hline(yintercept = 0) +
    geom_vline(xintercept = 0) + 
    ggtitle(title) 
}

breakchart(mtcars, wt, mpg, col = factor(cyl))
#> Warning: Removed 14 rows containing missing values (geom_point).

^{Created on 2022-03-10 by the reprex package (v2.0.1)}

answered Mar 10, 2022 at 3:52

Matt Cowgill

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2 Comments

natguy8 Over a year ago

Thank you, just had to adjust something small in the code while defining the function.

Matt Cowgill Over a year ago

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