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The ade4 Package - NexTag Supports Open Source Initiatives

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42 cailliez<br />

cailliez<br />

Transformation to make Euclidean a distance matrix<br />

Description<br />

Usage<br />

This function computes the smallest positive constant that makes Euclidean a distance matrix and<br />

applies it.<br />

cailliez(distmat, print = FALSE)<br />

Arguments<br />

distmat<br />

print<br />

an object of class dist<br />

if TRUE, prints the eigenvalues of the matrix<br />

Value<br />

an object of class dist containing a Euclidean distance matrix.<br />

Author(s)<br />

Daniel Chessel<br />

Stéphane Dray 〈dray@biomserv.univ-lyon1.fr〉<br />

References<br />

Cailliez, F. (1983) <strong>The</strong> analytical solution of the additive constant problem. Psychometrika, 48,<br />

305–310.<br />

Legendre, P. and Anderson, M.J. (1999) Distance-based redundancy analysis: testing multispecies<br />

responses in multifactorial ecological experiments. Ecological Monographs, 69, 1–24.<br />

Legendre, P., and Legendre, L. (1998) Numerical ecology, 2nd English edition edition. Elsevier<br />

Science BV, Amsterdam.<br />

From the DistPCoa program of P. Legendre et M.J. Anderson<br />

http://www.fas.umontreal.ca/BIOL/Casgrain/en/labo/distpcoa.html<br />

Examples<br />

data(capitales)<br />

d0

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