# B_02_barchart.table

##### table methods for barchart and dotplot

Contingency tables are often displayed using bar charts and dot plots. These methods operate directly on tables, bypassing the need to convert them to data frames for use with the formula interface. Matrices and arrays are also supported, by coercing them to tables.

- Keywords
- hplot

##### Usage

```
# S3 method for table
barchart(x, data, groups = TRUE,
origin = 0, stack = TRUE, …, horizontal = TRUE)
```# S3 method for array
barchart(x, data, …)

# S3 method for matrix
barchart(x, data, …)

# S3 method for table
dotplot(x, data, groups = TRUE, …, horizontal = TRUE)

# S3 method for array
dotplot(x, data, …)

# S3 method for matrix
dotplot(x, data, …)

##### Arguments

- x
A

`table`

,`array`

or`matrix`

object.- data
Should not be specified. If specified, will be ignored with a warning.

- groups
A logical flag, indicating whether to use the last dimension as a grouping variable in the display.

- origin, stack
Arguments to

`panel.barchart`

. The defaults for the`table`

method are different.- horizontal
Logical flag, indicating whether the plot should be horizontal (with the categorical variable on the y-axis) or vertical.

- …
Other arguments, passed to the underlying

`formula`

method.

##### Details

The first dimension is used as the variable on the categorical axis.
The last dimension is optionally used as a grouping variable (to
produce stacked barcharts by default). All other dimensions are used
as conditioning variables. The order of these variables cannot be
altered (except by permuting the original argument beforehand using
`t`

or `aperm`

). For more flexibility, use
the formula method after converting the table to a data frame using
the relevant `as.data.frame`

method.

##### Value

An object of class `"trellis"`

. The
`update`

method can be used to
update components of the object and the
`print`

method (usually called by
default) will plot it on an appropriate plotting device.

##### See Also

##### Examples

```
# NOT RUN {
barchart(Titanic, scales = list(x = "free"),
auto.key = list(title = "Survived"))
# }
```

*Documentation reproduced from package lattice, version 0.20-38, License: GPL (>= 2)*