Predict Method for G-means Clustering — predict.kmeans • gmeans

Predicted values based on the G-means clustering model.

Usage

# S3 method for class 'kmeans'
predict(
  object,
  newdata,
  method = c("euclidean", "manhatten", "minkowski"),
  p = 2,
  ...
)

Source

Adapted from clue

Arguments

object: of class inheriting from "kmeans".
newdata: matrix() new data to predict on.
method: character(1) distance metric to use. Either "euclidean", "manhattan", or "minkowski". Default is "euclidean".
p: numeric(1) power of the Minkowski distance. Default is 2.
...: additional arguments.

Details

The predict method for G-means clustering assigns new data points to the nearest cluster center identified by the G-means algorithm. The method uses the specified distance metric to calculate the distance between each new data point and all cluster centers, and then assigns each point to the cluster with the closest center.

The method argument specifies the distance metric to use. The following options:

"euclidean": The euclidean distance is the default metric used in the k-means and is defined as $$ d(x, y) = \sqrt{\sum_{i=1}^{n} (x_i - y_i)^2} $$
"manhatten": The Manhatten distance is defined as $$ d(x, y) = \sum_{i=1}^{n} |x_i - y_i| $$
"minkowski": The Minkowski distance is defined as $$ d(x, y) = \left( \sum_{i=1}^{n} |x_i - y_i|^p \right)^{1/p}, $$ where $p$ is a parameter that defines the distance type (e.g., $p=2$ for Euclidean, $p=1$ for Manhattan).

Examples

set.seed(123)
x <- as.matrix(iris[, -5])
cl <- gmeans(x)

newdata <- x[1:10, ]
predict(cl, newdata)
#>  [1] 6 9 9 9 6 1 9 6 4 9