scale_size {ggplot2}R Documentation

scale_size

Description

Size scale for continuous variable

Usage

scale_size(name=NULL, limits=NULL, breaks=NULL, labels=NULL, trans=NULL, to=c(1, 6), ...)

Arguments

name name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath
limits numeric vector of length 2, giving the extent of the scale
breaks numeric vector indicating where breaks should lie
labels character vector giving labels associated with breaks
trans a transformer to use
to numeric vector of length 2, giving minimum and maximum after transformation
... ignored

Details

This page describes scale_size, see layer and qplot for how to create a complete plot from individual components.

Value

A layer

Author(s)

Hadley Wickham, http://had.co.nz/

See Also

Examples

## Not run: 
(p <- qplot(mpg, cyl, data=mtcars, size=cyl))
p + scale_size("cylinders")
p + scale_size("number\nof\ncylinders")

p + scale_size(to = c(0, 10))
p + scale_size(to = c(1, 2))

# Map area, instead of width/radius
# Perceptually, this is a little better
p + scale_area()
p + scale_area(to = c(1, 25))

# Also works with factors, but not a terribly good
# idea, unless your factor is ordered, as in this example
qplot(mpg, cyl, data=mtcars, size=factor(cyl))

# To control the size mapping for discrete variable, use 
# scale_size_manual:
last_plot() + scale_size_manual(values=c(2,4,6))

## End(Not run)

[Package ggplot2 version 0.8.2 Index]