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% File src/library/graphics/man/boxplot.matrix.Rd
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% Part of the R package, http://www.R-project.org
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% Copyright 2008 R Core Team
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% Distributed under GPL 2 or later
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\newcommand{\CRANpkg}{\href{http://CRAN.R-project.org/package=#1}{\pkg{#1}}}
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\name{boxplot.matrix}
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\alias{boxplot.matrix}
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\title{Draw a Boxplot for each Column (Row) of a Matrix}
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\description{
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  Interpreting the columns (or rows) of a matrix as different groups, draw a
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  boxplot for each.
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}
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\usage{
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\method{boxplot}{matrix}(x, use.cols = TRUE, \dots)
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}
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\arguments{
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  \item{x}{a numeric matrix.}
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  \item{use.cols}{logical indicating if columns (by default) or rows
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    (\code{use.cols = FALSE}) should be plotted.}
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  \item{\dots}{Further arguments to \code{\link{boxplot}}.}
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}
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\value{
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  A list as for \code{\link{boxplot}}.
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}
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\author{Martin Maechler, 1995, for S+, then \R package \CRANpkg{sfsmisc}.}
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\seealso{\code{\link{boxplot.default}} which already works nowadays with
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  data.frames; \code{\link{boxplot.formula}}, \code{\link{plot.factor}} which
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  work with (the more general concept) of a grouping factor.
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}
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\examples{
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## Very similar to the example in ?boxplot
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mat <- cbind(Uni05 = (1:100)/21, Norm = rnorm(100),
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             T5 = rt(100, df = 5), Gam2 = rgamma(100, shape = 2))
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boxplot(mat, main = "boxplot.matrix(...., main = ...)",
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        notch = TRUE, col = 1:4)
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}
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\keyword{hplot}