R: Cassini Data

Cassini {clue} | R Documentation

## 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")

### Format

A classed list with components

`x`

  a matrix with 1000 rows and 2 columns giving the coordinates of the points.

`classes`

  a factor indicating which structure the respective points belong to.

### 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)

[Package clue version 0.3-54 Index]