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Estimate Bandwidth Parameter (Sigma) for the Heat Kernel

Source: R/knn_weights.R
estimate_sigma.Rd

Estimate a reasonable bandwidth parameter (sigma) for the heat kernel based on a data matrix and the specified quantile of the frequency distribution of distances.

Usage

estimate_sigma(X, prop = 0.25, nsamples = 500, normalized = FALSE)

Arguments

X

A data matrix where samples are rows and features are columns.

prop

A numeric value representing the quantile of the frequency distribution of distances used to determine the bandwidth parameter. Default is 0.25.

nsamples

An integer representing the number of samples to draw from the data matrix. Default is 500.

normalized

A logical value indicating whether to normalize the data. Default is FALSE.

Value

A numeric value representing the estimated bandwidth parameter (sigma) for the heat kernel.

Examples

X <- matrix(rnorm(1000), nrow=100, ncol=10)

sigma_default <- estimate_sigma(X)

sigma_custom <- estimate_sigma(X, prop=0.3, nsamples=300)