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

```
# S3 method for matrix
boxplot(x, use.cols = TRUE, …)
```

x

a numeric matrix.

use.cols

logical indicating if columns (by default) or rows
(`use.cols = FALSE`

) should be plotted.

…

Further arguments to `boxplot`

.

A list as for `boxplot`

.

`boxplot.default`

which already works nowadays with
data.frames; `boxplot.formula`

, `plot.factor`

which
work with (the more general concept) of a grouping factor.

# NOT RUN { ## 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) # }