Draw a Boxplot for each Column (Row) of a Matrix

Description

Interpreting the columns (or rows) of a matrix as different groups, draw a boxplot for each.

Usage

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## S3 method for class 'matrix'
boxplot(x, use.cols = TRUE, ...)

Arguments

x

a numeric matrix.

use.cols

logical indicating if columns (by default) or rows (use.cols = FALSE) should be plotted.

...

Further arguments to boxplot.

Value

A list as for boxplot.

Author(s)

Martin Maechler, 1995, for S+, then R package sfsmisc.

See Also

boxplot.default which already works nowadays with data.frames; boxplot.formula, plot.factor which work with (the more general concept) of a grouping factor.

Examples

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## Very similar to the example in ?boxplot
mat <- cbind(Uni05 = (1:100)/21, Norm = rnorm(100),
             T5 = rt(100, df = 5), Gam2 = rgamma(100, shape = 2))
boxplot(mat, main = "boxplot.matrix(...., main = ...)",
        notch = TRUE, col = 1:4)

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