clue (version 0.1-0)

Cassini: Cassini Data

Description

A Cassini data set with 1000 points in 2-dimensional space which are drawn from the uniform distribution on 3 structures. The two outer structures are banana-shaped; the middle structure in between them is a circle.

Usage

data("Cassini")

Details

Instances of Cassini data sets can be created using function mlbench.cassini in package mlbench. The data set at hand was obtained using library("mlbench") set.seed(1234) Cassini <- mlbench.cassini(1000)

Examples

data("Cassini")
op <- par(mfcol = c(1, 2))
## Plot the data set:
plot(Cassini$x, col = as.integer(Cassini$classes),
     xlab = "", ylab = "")
## Create a "random" k-means partition of the data:
set.seed(1234)
party <- kmeans(Cassini$x, 3)
## And plot that.
plot(Cassini$x, col = cl_class_ids(party),
     xlab = "", ylab = "")
## (We can see the problem ...)
par(op)