ggplot2 (version 0.9.0)

scale_x_datetime: Position scale, date

Description

Position scale, date

Usage

scale_x_datetime(..., expand = c(0.05, 0),
    breaks = waiver(), minor_breaks = waiver())
  scale_y_datetime(..., expand = c(0.05, 0),
    breaks = waiver(), minor_breaks = waiver())

Arguments

breaks

A vector of breaks, a function that given the scale limits returns a vector of breaks, or a character vector, specifying the width between breaks. For more information about the first two, see continu

minor_breaks

Either NULL for no minor breaks, waiver() for the default breaks (one minor break between each major break), a numeric vector of positions, or a function that given the limits returns a vector of minor breaks.

...

common continuous scale parameters: name, breaks, labels, na.value, limits and trans. See continuous_scale for m

expand

a numeric vector of length two giving multiplicative and additive expansion constants. These constants ensure that the data is placed some distance away from the axes.

See Also

Other position scales: scale_x_continuous, scale_x_date, scale_x_discrete, scale_x_log10, scale_x_reverse, scale_x_sqrt, scale_y_continuous, scale_y_date, scale_y_discrete, scale_y_log10, scale_y_reverse, scale_y_sqrt

Examples

start <- ISOdate(2001, 1, 1, tz = "")
df <- data.frame(
  day30  = start + round(runif(100, max = 30 * 86400)),
  day7  = start + round(runif(100, max = 7 * 86400)),
  day   = start + round(runif(100, max = 86400)),
  hour10 = start + round(runif(100, max = 10 * 3600)),
  hour5 = start + round(runif(100, max = 5 * 3600)),
  hour  = start + round(runif(100, max = 3600)),
  min10 = start + round(runif(100, max = 10 * 60)),
  min5  = start + round(runif(100, max = 5 * 60)),
  min   = start + round(runif(100, max = 60)),
  sec10 = start + round(runif(100, max = 10)),
  y = runif(100)
)

# Automatic scale selection
qplot(sec10, y, data = df)
qplot(min, y, data = df)
qplot(min5, y, data = df)
qplot(min10, y, data = df)
qplot(hour, y, data = df)
qplot(hour5, y, data = df)
qplot(hour10, y, data = df)
qplot(day, y, data = df)
qplot(day30, y, data = df)

# Manual scale selection
qplot(day30, y, data = df)
library(scales) # to access breaks/formatting functions
last_plot() + scale_x_datetime(breaks = date_breaks("2 weeks"))
last_plot() + scale_x_datetime(breaks = date_breaks("10 days"))
library(scales) # to access breaks/formatting functions
last_plot() + scale_x_datetime(breaks = date_breaks("10 days"),
  labels = date_format("%d/%m"))
last_plot() + scale_x_datetime(breaks = date_breaks("1 day"),
  minor_breaks = date_breaks("2 hour"))