ade4 (version 1.01)

quasieuclid: Transformation of a distance matrice to an Euclidean one

Description

transforms a distance matrix in an Euclidean one.

Usage

quasieuclid(distmat)

Arguments

distmat

an object of class 'dist'

Value

• object of class 'dist' containing an Euclidean distance matrice

Details

The function creates a distance matrice with the positive eigenvalues of the Euclidean representation. Only for Euclidean distances which are not Euclidean for numeric approximations (for examples, in papers as the following example).

Examples

data(yanomama)
geo <- as.dist(yanomama$geo)
is.euclid(geo) # FALSE
geo1 <- quasieuclid(geo)
is.euclid(geo1) # TRUE
par(mfrow = c(2,2))
lapply(yanomama, function(x) plot(as.dist(x), quasieuclid(as.dist(x))))