ng_data: Create an NG_data object to be used by a navGraph session
In RnavGraph: Using Graphs as a Navigational Infrastructure

Description Usage Arguments Value Author(s) See Also Examples

NG_data objects wrap the data to be explored and some meta data such as the data name, variable short names, the group identifier and text labels for each observation.

1	ng_data(name, data, shortnames = character(0), group = numeric(0), labels = character(0))

`name`	Character string containing no spaces. Note that for a single navGraph session, the names of all the NG_data objects passed by to `navGraph` must be unique.
`data`	`data.frame` with only numeric variables.
`shortnames`	If the variable names of the data argument are too long or contain spaces, shortnames can be specified.
`group`	Vector of group identifiers for each observation. For the tk2d display, one can use color names (see `colors`) to map a certain color directly to the objects.
`labels`	Factor- or character sting vector with labels for each observation.

NG_data object.

Adrian Waddell and R. Wayne Oldford

navGraph, shortnames-methods, ng_get-methods, ng_set-methods

## minimal example
ng.iris <- ng_data(name = "iris", data = iris[,1:4])
ng.iris ## see output


## full specification
ng.iris <- ng_data(name = "iris", data = iris[,1:4],
		shortnames = c('s.L', 's.W', 'p.L', 'p.W'),
		group = iris$Species,
		labels = substr(iris$Species,1,2))

## see shortnames
shortnames(ng.iris)
## change shortnames
shortnames(ng.iris) <- c("a","b","c","d")
## see variable names
names(ng.iris)
## change variable names
names(ng.iris) <- LETTERS[1:4]

## ng_get
ng_get(ng.iris)
ng_get(ng.iris,"group")

## ng_set
ng_set(ng.iris)
ng_set(ng.iris,"group") <- iris$Species