fpc: dridgeline – R documentation

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dridgeline

Density along the ridgeline

Description

Computes the density of a two-component Gaussian mixture along the ridgeline (Ray and Lindsay, 2005), along which all its density extrema are located.

Usage

dridgeline(alpha=seq(0,1,0.001), prop,
                          mu1, mu2, Sigma1, Sigma2, showplot=FALSE, ...)

Arguments

`alpha`	sequence of values between 0 and 1 for which the density is computed.
`prop`	mixture proportion of first component.
`mu1`	mean vector of component 1.
`mu2`	mean vector of component 2.
`Sigma1`	covariance matrix of component 1.
`Sigma2`	covariance matrix of component 2.
`showplot`	logical. If `TRUE`, the density is plotted against `alpha`.
`...`	further arguments to be passed on to plot.

Value

Vector of density values for values of alpha.

Author(s)

Christian Hennig christian.hennig@unibo.it https://www.unibo.it/sitoweb/christian.hennig/en/

References

Ray, S. and Lindsay, B. G. (2005) The Topography of Multivariate Normal Mixtures, Annals of Statistics, 33, 2042-2065.

Examples

q <- dridgeline(seq(0,1,0.1),0.5,c(1,1),c(2,5),diag(2),diag(2))

fpc

Flexible Procedures for Clustering

v2.2-9

GPL

Authors

Christian Hennig <christian.hennig@unibo.it>

Initial release

2020-12-06