quasieuclid: Transformation of a distance matrice to a Euclidean one

In ade4: Analysis of Ecological Data : Exploratory and Euclidean Methods in Environmental Sciences

Description

transforms a distance matrix in a Euclidean one.

Usage

quasieuclid(distmat)

Arguments

distmat

an object of class dist

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).

Value

object of class dist containing a Euclidean distance matrice

Author(s)

Daniel Chessel
Stéphane Dray [e-mail]

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))))

par(mfrow = c(1,1))

ade4 documentation built on May 2, 2019, 5:50 p.m.