gggroup: Grob function: groups

In hadley/ggplot1: Before there was ggplot2

Grob function: groups

Description

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.

Usage

gggroup(plot, aesthetics = list(), ..., data = NULL)

Arguments

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

Details

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:

• any other grobs used by the grob function you choose

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

• anything else used by the grob function you choose

Examples

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)

hadley/ggplot1 documentation built on Dec. 1, 2024, 11:23 a.m.