gggroup {ggplot} | R Documentation |
Create multiple of grobs based on id aesthetic.
gggroup(plot = .PLOT, aesthetics=list(), ..., data=NULL)
plot |
the plot object to modify |
aesthetics |
named list of aesthetic mappings, see details for more information |
... |
other options, see details for more information |
data |
data source, if not specified the plot default will be used |
This grob function provides a general means of creating multiple grobs based on groups in the data. This is useful if you want to fit a separate smoother for each group in the data.
You will need an id variable in your aesthetics list with determines how the data is broken down.
Aesthetic mappings that this grob function understands:
x
:x position (required)
y
:y position (required)
id
:
These can be specified in the plot defaults (see ggplot
) or
in the aesthetics
argument. If you want to modify the position
of the points or any axis options, you will need to add a position scale to
the plot. These functions start with ps
, eg.
pscontinuous
or pscategorical
Other options:
grob
:grob function to use for subgroups
Hadley Wickham <h.wickham@gmail.com>
p <- ggplot(mtcars, aesthetics=list(y=wt, x=qsec, id=cyl, colour=cyl)) gggroup(p) gggroup(p, grob="density") gggroup(p, grob="histogram", aes=list(fill=cyl)) gggroup(ggpoint(p), grob="smooth", se=FALSE, span=1) gggroup(ggpoint(p), aes=list(id=cyl, size=cyl), grob="smooth", span=1)