How to change the histogram borderline thickness in ggplot geom_histogram()

Question

I have the following code:

library(ggplot2)
data(mtcars)
ggplot(mtcars, aes(x=mpg)) + geom_histogram(bins=15, colour='red')

Which produce this:

As stated there, how can I change the thickness of the enclosing line of the histogram?

Clachan

Best practice is to remove border line – Cleanshaven

but you can use size=3 – Cleanshaven

Answer 1

Just use size argument

geom_histogram(bins=15, colour='red',size=2)

Pencil

Answer 2

Easy enough :)

ggplot(mtcars, aes(x=mpg)) + geom_histogram(bins=15, colour='red',size=3)

Rawalpindi

Answer 3

In addition, to program in point space, I used the following function:

MyPoints <- function(desired_points){
  return (unit(desired_points*.5*(1/1.07), "point"))
}

geom_histogram(size=MyPoints(1))

Szombathely

Answer 4

Just tested on ggplot2, the size aesthetic for lines was deprecated in ggplot2 version 3.4.0.

You can do the same using linewidth.

ggplot(mtcars, aes(x=mpg)) + 
    geom_histogram(bins=15, colour='red', linewidth=0.2)

Bushel