scale_continuous {ggplot2}R Documentation

scale\_continuous

Description

Continuous position scale

Usage

scale_x_continuous(name = NULL, limits = NULL, breaks = NULL, 
    labels = NULL, trans = NULL, expand = c(0.05, 0), minor_breaks = NULL, 
    formatter = "scientific", legend = TRUE, ...)

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

expand

numeric vector of length 2, giving multiplicative and additive expansion factors

minor_breaks

NULL

formatter

NULL

legend

NULL

...

ignored

Details

This page describes scale\_continuous, 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: 
(m <- qplot(rating, votes, data=subset(movies, votes > 1000), na.rm = T))

# Manipulating the default position scales lets you:

#  * change the axis labels
m + scale_y_continuous("number of votes")
m + scale_y_continuous(expression(votes^alpha))

#  * modify the axis limits
m + scale_y_continuous(limits=c(0, 5000))
m + scale_y_continuous(limits=c(1000, 10000))
m + scale_x_continuous(limits=c(7, 8))

# you can also use the short hand functions xlim and ylim
m + ylim(0, 5000)
m + ylim(1000, 10000)
m + xlim(7, 8)

#  * choose where the ticks appear
m + scale_x_continuous(breaks=1:10)
m + scale_x_continuous(breaks=c(1,3,7,9))

#  * manually label the ticks
m + scale_x_continuous(breaks=c(2,5,8), labels=c("two", "five", "eight"))
m + scale_x_continuous(breaks=c(2,5,8), labels=c("horrible", "ok", "awesome"))
m + scale_x_continuous(breaks=c(2,5,8), labels=expression(Alpha, Beta, Omega))

# There are also a wide range of transformations you can use:
m + scale_y_log10()
m + scale_y_log()
m + scale_y_log2()
m + scale_y_sqrt()
m + scale_y_reverse()
# see ?transformer for a full list

# You can control the formatting of the labels with the formatter
# argument.  Some common formats are built in:
x <- rnorm(10) * 100000
y <- seq(0, 1, length = 10)
p <- qplot(x, y)
p + scale_y_continuous(formatter = "percent")
p + scale_y_continuous(formatter = "dollar")
p + scale_x_continuous(formatter = "comma")

# qplot allows you to do some of this with a little less typing:
#   * axis limits
qplot(rating, votes, data=movies, ylim=c(1e4, 5e4))
#   * axis labels
qplot(rating, votes, data=movies, xlab="My x axis", ylab="My y axis")
#   * log scaling
qplot(rating, votes, data=movies, log="xy")

## End(Not run)

[Package ggplot2 version 0.8.9 Index]