Description Usage Format Details Examples

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.

1 | ```
data("Cassini")
``` |

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.

Instances of Cassini data sets can be created using function
`mlbench.cassini`

in package mlbench.
The data set at hand was obtained using

1 2 3 4 |

1 2 3 4 5 6 7 8 9 10 11 12 13 | ```
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)
``` |

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