scale_date {ggplot2}R Documentation

scale_date

Description

Position scale, date

Usage

scale_x_date(name=NULL, limits=NULL, major=NULL, minor=NULL, format=NULL, ...)
scale_y_date(name=NULL, limits=NULL, major=NULL, minor=NULL, format=NULL, ...)

Arguments

name name of scale to appear in legend or on axis
limits numeric vector of length 2, giving the extent of the scale
major NULL
minor NULL
format NULL
... ignored

Details

This page describes scale_date, 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: 
# We'll start by creating some nonsense data with dates
df <- data.frame(
  date = seq(Sys.Date(), len=100, by="1 day")[sample(100, 50)],
  price = runif(50)
)
df <- df[order(df$date), ]
dt <- qplot(date, price, data=df, geom="line") + opts(aspect.ratio = 1/4)

# We can control the format of the labels, and the frequency of 
# the major and minor tickmarks.  See ?format.Date and ?seq.Date 
# for more details.
dt + scale_x_date()
dt + scale_x_date(format="
dt + scale_x_date(format="
dt + scale_x_date(major="months", minor="weeks", format="
dt + scale_x_date(major="months", minor="3 days", format="
dt + scale_x_date(major="years", format="

# The date scale will attempt to pick sensible defaults for 
# major and minor tick marks
qplot(date, price, data=df[1:10,], geom="line")
qplot(date, price, data=df[1:4,], geom="line")

df <- data.frame(
  date = seq(Sys.Date(), len=1000, by="1 day"),
  price = runif(500)
)
qplot(date, price, data=df, geom="line")

# A real example using economic time series data
qplot(date, psavert, data=economics) 
qplot(date, psavert, data=economics, geom="path") 

end <- max(economics$date)
last_plot() + scale_x_date(lim = c(as.Date("2000-1-1"), end))
last_plot() + scale_x_date(lim = c(as.Date("2005-1-1"), end))
last_plot() + scale_x_date(lim = c(as.Date("2006-1-1"), end))
## End(Not run)

[Package ggplot2 version 0.7 Index]