dbscan (version 1.1-11)

NN: NN --- Nearest Neighbors Superclass

Description

NN is an abstract S3 superclass for the classes of the objects returned by kNN(), frNN() and sNN(). Methods for sorting, plotting and getting an adjacency list are defined.

Usage

adjacencylist(x, ...)
# S3 method for NN
adjacencylist(x, ...)
# S3 method for NN
sort(x, decreasing = FALSE, ...)
# S3 method for NN
plot(x, data, main = NULL, pch = 16, col = NULL, linecol = "gray", ...)

Arguments

x

a NN object

...

further parameters past on to plot().

decreasing

sort in decreasing order?

data

that was used to create x

main

title

pch

plotting character.

col

color used for the data points (nodes).

linecol

color used for edges.

Subclasses

kNN, frNN and sNN

Author

Michael Hahsler

See Also

Other NN functions: comps(), frNN(), kNNdist(), kNN(), sNN()

Examples

data(iris)
x <- iris[, -5]

# finding kNN directly in data (using a kd-tree)
nn <- kNN(x, k=5)
nn

# plot the kNN where NN are shown as line conecting points.
plot(nn, x)

# show the first few elements of the adjacency list
head(adjacencylist(nn))

if (FALSE) {
# create a graph and find connected components (if igraph is installed)
library("igraph")
g <- graph_from_adj_list(adjacencylist(nn))
comp <- components(g)
plot(x, col = comp$membership)

# detect clusters (communities) with the label propagation algorithm
cl <- membership(cluster_label_prop(g))
plot(x, col = cl)
}