radviz2d: Radial Coordinate Visualization

Description

Radviz is a radial spring-based visualization that permits the visualization of n-dimensional datasets. Data attributes are equidistantly distributed along the circumference of a circle. Each data item is virtually connected to a spring that starts at the circle perimeter and ends on the data item. Each spring pulls the item with a force proportional to the item attribute value. Depending on the value of each attribute, the forces of the springs project each data item to a position inside the circle where the sum of the spring forces is equal to zero.

Usage

radviz2d(dataset, name = "")

Arguments

dataset

The dataset to be visualized.

name

The name of the dataset to be used in the graph title.

Value

A Radviz visualization of the original dataset is returned.

Details

Some features of this visualization are: l) Points where all dimensional values have approximately the same value will lie close to the center. 2) If dimensional points lie opposite each other on the circle and have similar values than points will lie near the center. 3) If 1 or 2 dimensional values are greater, points will lie closer to those dimensional points. 4) Where a point will lie depends on the layout of the particular dimensions around the circle. 5) This is a non-linear projection from N-dimensions down to 2 dimensions 6) Certain symmetries of the data will be preserved.

The function assumes the class labels are in the last column. Class column may be either a numeric vector or a factor.

References

Ankerst M., Keim D. A., Kriegel H.-P. Circle Segments: A Technique for Visually Exploring Large Multidimensional Data Sets, IEEE Visualization, 1996.

K.A. Olsen, R.R. Korfhage, K.M. Sochats, M.B. Spring and J.G. Williams. Visualisation of a Document Collection: The VIBE System, Information Processing and Management, Vol. 29, No. 1, pp. 69-81, Pergamon Press Ltd, 1993.

Examples

Run this code

data(iris)
radviz2d(iris,"Iris")

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