ng_data: Create an NG_data object to be used by a navGraph session

In RnavGraph: Using Graphs as a Navigational Infrastructure

Description

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.

Usage

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

Arguments

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.

Value

NG_data object.

Author(s)

Adrian Waddell and R. Wayne Oldford

See Also

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

Examples

## 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

RnavGraph documentation built on May 29, 2017, 4:18 p.m.