R: Information on Data Sets in Packages

datasets {vcdExtra} | R Documentation

## Information on Data Sets in Packages

### Description

The `data` function is used both to load data sets from packages, and give a display of the names and titles of data sets in one or more packages, however it does not return a result that can be easily used to get additional information about the nature of data sets in packages.

The `datasets()` function is designed to produce a more useful summary display of data sets in one or more packages. It extracts the `class` and dimension information (`dim` or codelength) of each item, and formats these to provide additional descriptors.

### Usage

    datasets(package, allClass=FALSE,
        incPackage=length(package) > 1,
        maxTitle=NULL)

### Arguments

`package` | a character vector giving the package(s) to look in
`allClass` | include all classes of the item (`TRUE`) or just the last class (`FALSE`)?
`incPackage` | include the package name in result?
`maxTitle` | maximum length of data set Title

### Details

The requested packages must be installed, and are silently loaded in order to extract `class` and size information.

### Value

A `data.frame` whose rows correspond to data sets found in `package`. The columns (for a single package) are:

`Item` | data set name
`class` | class
`dim` | an abbreviation of the dimensions of the data set
`Title` | data set title

### Author(s)

Michael Friendly, with R-help from Curt Seeliger

### See Also

`data`,

### Examples

    datasets("vcdExtra")
    datasets(c("vcd", "vcdExtra"))
    datasets("datasets", maxTitle=50)

[Package vcdExtra version 0.7-1 Index]