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Centred log-ratio transformation
The clr transformation moves D-part compositional data from the simplex into a D-dimensional real space.
multivariate data ideally of class data.frame or matrix
Each composition is divided by the geometric mean of its parts before the logarithm is taken. 
The transformed data, including
\item{x.clr}{clr transformed data}
\item{gm}{the geometric means of the original composition.}
Aitchison, J. (1986) \emph{The Statistical Analysis of Compositional
Data} Monographs on Statistics and Applied Probability. Chapman \&
Hall Ltd., London (UK). 416p.
Matthias Templ
The resulting transformed data set is singular by definition.
\code{\link{cenLR}}, \code{\link{cenLRinv}}, \code{\link[compositions]{clr}}
## function is deprecated, use cenLR instead.
\keyword{ manip }
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