+
is the key to constructing sophisticated ggplot2 graphics. It
allows you to start simple, then get more and more complex, checking your
work at each step.
# S3 method for gg +(e1, e2) e1 %+% e2
e1 | |
---|---|
e2 | A plot component, as described below. |
You can add any of the following types of objects:
An aes()
object replaces the default aesthetics.
A layer created by a geom_
or stat_
function adds a
new layer.
A scale
overrides the existing scale.
A theme()
modifies the current theme.
A coord
overrides the current coordinate system.
A facet
specification overrides the current faceting.
To replace the current default data frame, you must use %+%
,
due to S3 method precedence issues.
You can also supply a list, in which case each element of the list will be added in turn.
#># To override the data, you must use %+% base %+% subset(mpg, fl == "p")# Alternatively, you can add multiple components with a list. # This can be useful to return from a function. base + list(subset(mpg, fl == "p"), geom_smooth())#>