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\name{scale_x_datetime}
\alias{scale_x_datetime}
\alias{scale_y_datetime}
\title{Position scale, date}
\usage{
scale_x_datetime(..., expand = waiver(),
breaks = pretty_breaks(), minor_breaks = waiver())
scale_y_datetime(..., expand = waiver(),
breaks = pretty_breaks(), minor_breaks = waiver())
}
\arguments{
\item{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
\code{\link{continuous_scale}}, for more information
about the last, see \code{\link[scales]{date_breaks}}`.}
\item{minor_breaks}{Either \code{NULL} for no minor
breaks, \code{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.}
\item{...}{common continuous scale parameters:
\code{name}, \code{breaks}, \code{labels},
\code{na.value}, \code{limits} and \code{trans}. See
\code{\link{continuous_scale}} for more details}
\item{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.}
}
\description{
Position scale, date
}
\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"))
}
\seealso{
Other position scales: \code{\link{scale_x_continuous}},
\code{\link{scale_x_date}},
\code{\link{scale_x_discrete}},
\code{\link{scale_x_log10}},
\code{\link{scale_x_reverse}},
\code{\link{scale_x_sqrt}},
\code{\link{scale_y_continuous}},
\code{\link{scale_y_date}},
\code{\link{scale_y_discrete}},
\code{\link{scale_y_log10}},
\code{\link{scale_y_reverse}}, \code{\link{scale_y_sqrt}}
}
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