TT.chemometrics.alr

divisorvar

css.names

Function that compute the additive 
log-ratio transformation of compositional data (here texture 
data). This a a copy-paste-and-rename of the alr function provided 
by the package chemometrics: P. Filzmoser and K. Varmuza (2008). 
chemometrics: Multivariate Statistical Analysis in Chemometrics. 
R package version 0.4.
The function has been modified so it returns NA when a value 
is below or equal to zero (this happens when using a regular 
grid of texture data, for practical reasons).
The function has also been modified so it uses column name
rather than column index.

"The Soil Texture Wizard" is a set of R functions designed
        to produce texture triangles (also called texture plots,
        texture diagrams, texture ternary plots), classify and
        transform soil textures data. These functions virtually allows
        to plot any soil texture triangle / classification into any
        triangle geometry (isosceles, right-angled triangles, etc.).
        This set of function is expected to be useful to people using
        soil textures data from different soil texture classification
        or different particle size systems. Several texture triangles
        are predefined: USDA; FAO (which is also the triangle for the
        soil map of Europe); Aisne (France); GEPPA (France); German
        triangles "Bodenkundliche Kartieranleitung 1994", "SEA 1974"
        and "TGL 1985"; Soil Survey of England and Wales; Australian
        triangle; Belgian triangle; Canadian triangle; ISSS triangle;
        Romanian triangle; Polish triangle.

TT.chemometrics.alr: Compute the additive log-ratio transformation of compositional data.

Description

Usage

Arguments