https://github.com/cran/lattice
Tip revision: ebfa585dca6912017dd9beafc73c9c02eda9acc8 authored by Deepayan Sarkar on 24 March 2013, 00:00:00 UTC
version 0.20-15
version 0.20-15
Tip revision: ebfa585
panel.barchart.Rd
\name{F_1_panel.barchart}
\alias{panel.barchart}
\title{ Default Panel Function for barchart}
\description{
Default panel function for \code{barchart}.
}
\usage{
panel.barchart(x, y, box.ratio = 1, box.width,
horizontal = TRUE,
origin = NULL, reference = TRUE,
stack = FALSE,
groups = NULL,
col = if (is.null(groups)) plot.polygon$col
else superpose.polygon$col,
border = if (is.null(groups)) plot.polygon$border
else superpose.polygon$border,
lty = if (is.null(groups)) plot.polygon$lty
else superpose.polygon$lty,
lwd = if (is.null(groups)) plot.polygon$lwd
else superpose.polygon$lwd,
\dots, identifier = "barchart")
}
\arguments{
\item{x}{ Extent of Bars. By default, bars start at left of panel,
unless \code{origin} is specified, in which case they start there.
}
\item{y}{ Horizontal location of bars. Possibly a factor. }
\item{box.ratio}{ Ratio of bar width to inter-bar space. }
\item{box.width}{ Thickness of bars in absolute units; overrides
\code{box.ratio}. Useful for specifying thickness when the
categorical variable is not a factor, as use of \code{box.ratio}
alone cannot achieve a thickness greater than 1. }
\item{horizontal}{
Logical flag. If FALSE, the plot is \sQuote{transposed} in the sense
that the behaviours of x and y are switched. x is now the
\sQuote{factor}. Interpretation of other arguments change
accordingly. See documentation of \code{\link{bwplot}} for a fuller
explanation.
}
\item{origin}{ The origin for the bars. For grouped displays with
\code{stack = TRUE}, this argument is ignored and the origin set to
0. Otherwise, defaults to \code{NULL}, in which case bars start at
the left (or bottom) end of a panel. This choice is somewhat
unfortuntate, as it can be misleading, but is the default for
historical reasons. For tabular (or similar) data, \code{origin =
0} is usually more appropriate; if not, one should reconsider the
use of a bar chart in the first place (dot plots are often a good
alternative).
}
\item{reference}{ Logical, whether a reference line is to be drawn at
the origin.
}
\item{stack}{ logical, relevant when groups is non-null. If
\code{FALSE} (the default), bars for different values of the
grouping variable are drawn side by side, otherwise they are
stacked.
}
\item{groups}{ Optional grouping variable. }
\item{col, border, lty, lwd}{
Graphical parameters for the bars. By default, the trellis parameter
\code{plot.polygon} is used if there is no grouping variable, otherwise
\code{superpose.polygon} is used. \code{col} gives the fill color,
\code{border} the border color, and \code{lty} and \code{lwd} the
line type and width of the borders.
}
\item{\dots}{ Extra arguments will be accepted but ignored. }
\item{identifier}{
A character string that is prepended to the names of grobs
that are created by this panel function.
}
}
\details{
A barchart is drawn in the panel. Note that most arguments controlling
the display can be supplied to the high-level \code{barchart} call
directly.
}
\seealso{
\code{\link{barchart}}
}
\examples{
barchart(yield ~ variety | site, data = barley,
groups = year, layout = c(1,6), origin = 0,
ylab = "Barley Yield (bushels/acre)",
scales = list(x = list(abbreviate = TRUE,
minlength = 5)))
}
\author{ Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}}
\keyword{dplot}