R: Density along the ridgeline

dridgeline {fpc} | R Documentation

## 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 c.hennig@ucl.ac.uk http://www.homepages.ucl.ac.uk/~ucakche/

### 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))

[Package fpc version 2.1-10 Index]