Cassini {clue} | R Documentation |
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.
data("Cassini")
A classed list with components
x
classes
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)
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)