CODEWITHSUNDEEP
rggplot2
Ricol
Ricol

Reputation: 377

Ggplot2: geom or aes?

I'm trying to understand the logic of the ggplot syntax and I don't understand why sometimes some parameters are in the geom part instead of the aes part.

For instance in geom_text in which case size have to be specified in geom instead of aes ?

Upvotes: 0

Views: 117

Answers (1)

r.bot
r.bot

Reputation: 5424

In ggplot aes() is used to map a variable to the way it is displayed. Extending the documentation, if one wants to vary the geom_text() by cyl one would do

p <- ggplot(mtcars, aes(x=wt, y=mpg, label=rownames(mtcars)))
p + geom_text(aes(size = cyl))

aes

Alternatively, one might wish to set an arbitrary value for all of the text displayed:

p + geom_text(size = 10)

arbitrary

Upvotes: 1

Related Questions